I am usually right behind silenus in threads about brewing beer. My actual area of expertise is in brewing microbiology, but that doesn’t come up as often as I would hope, so I glom on to the homebrew threads.
Animal trivia, especially dogs & horses.
I am an eclectic individual. I list these in my User Profile:
Interests: Baseball, Computers, Wood working, Wooden Sail Boats, Trains, Sci-Fi & History
I am specifically an Expert RPG/RPGLE Programmer on AS400/Iseries IBM computers.
I can build good solid workhorse PC’s.
I have a lot of Knowledge in Baseball and Tolkien Trivia. I have a wide ranging knowledge of older Sci-Fi/Fantasy in General and 1st edition D&D.
My knowledge of History and Science pales on this board, but in everyday life I am the local expert and answer guy.
I am getting better at Wood working and I really enjoy it.
I am very good at electrical work and wiring.
Jim
Tell me about it.
I don’t really consider myself an expert in anything but these are the things I usually answer questions about:
structural/civil engineering
rowing/coaching
Japanese
yaoi/slash
shoes/fashion if I have an opinion
nutrition
I’m a research mouse expert. I have been working with genetically altered mice for the past 5 years.
I’m going to be listed as an author on a paper in the journal Oncogene soon! 
This will be my first authorship credit.
I also know a little bit about paganism, but since its such a large catagory I can’t claim to be an expert. I know more about American and English history than a lot of people (outside of the SDMB).
I’ve been told by friends and co-workers that I can be very funny. One of the reasons I became a Doper is to develope my writing skills to reflect this part of me.
Psychology! I’m getting my master’s degree in two weeks!!
(excuse my excitement)
Around here I can generally answer questions about math and exercise physiology (and related topics). I can usually contribute to C++ threads unless the question is specific to the win32 API.
Puzzles, and most forms of wordplay. Gardening.
I’ll join Papsett on the dog trivia - and training. Birds. Clock repair. Landscape horticulture, with an emphasis on organics and native plants of this area (Minnesota)
Photography
Bible stuff
Several facets of construction and remodel
Star Trek
General Sci-Fi
Astronomy (on a lay level)
Amature telescopes
Besides that, I often find various diverse things interesting from time to time and research the hell out of them. Add to that a pretty good memory and you end up with a guy who can join in on discussions of a variety of topics.
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Electric guitar. 20 years experience playing. I’ve recorded five or six full-length albums, and have quite a bit of knowledge on the technical/hardware/equipment end as well as knowing how to play.
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Call Center Operations. I don’t know how I fell into call center customer service as a career, but I’ve been at it for several years now, with different companies and in different positions, and I consider myself very knowledgeable.
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Mormonism. I’m now an ex-Mormon, but I stuck around long enough (25+ years) to learn a great deal about it. I’ve been through the mysterious temple ceremonies as well as served a full-time mission. I’m also not bitter against the Mormon church at all, so I’m a good person to ask questions if you want informed answers with no agenda.
I’m sort of a jack-of-all-trades. I’m not up to the standards of the luminaries of General Questions, but if they happen to not be around, I can often come up with a captain-dummy-talk answer for the interim. There are a few odd topics that someone might look to me for, I suppose:
mead brewing (Not beer, not wine, just mead. And there are other brewers here who can certainly match or best me on the topic.)
LARPing (Live action role-playing gaming, both playing and producing games. Subtopics might include improvised props and special effects, quick character changes, boffer weapons, and things like that.)
mimicking accents
traditional (and non-traditional) sea shanties
Cajun or Creole cooking
I don’t claim great expertise in any of those things, but real experts might be a bit thin on the ground, even around here.
Thread crochet. Single parenting on a tight budget. Canadian mountain parks. Immigration to the US.
Hardware, plumbing, bathroom and tiling sales. I could sell you everything you need to build and furnish an entire house, in my sleep.
Kicking ass in the gym.
Being a prick.
I’m a computer geek by day. Specifically, SQL Server DBA doing application development in Access and Visual Basic.
In the evenings, I teach Taekwondo. I’m a 5th Degree Black Belt, certified instructor, with the American Taekwondo Association.
Risk Mgmt specializing in online fraud detection and prevention.
SQL/SAS data crunching
US History
The Catholic Church
I can hold my own in chess and billiards
I’m considered among my peers as the “wine expert/snob” though it just an amateur interest.
Lastly, I’m a self-proclaimed White Stripes fanatic. So I know quite a bit about the band.
Right. When I find my area, will this thread still be up? I have my doubts.
I know a little about some things, and even less about a lot, but I don’t really know a lot about anything. I know just enough to make myself look knowledgeable to someone completely unfamiliar with whatever it might be. I guess I better do something about that. The thing is, I’m interested in a lot of things, but I have no idea what sort of expertise would be most compatible with the way I think and behave. I’d hate to put in a lot of time on something and then realize that I’m not really much farther in my knowledge of it than I was when I started.
You’re good at circular prose.