WOOOO! Way to go, bud! Much happiness and good times to the both of you! 
Congratulations!
'Grats to you and the future Mrs.…uh, your one true love!
Congrats, congrats, congrats!
Everyone’s getting engaged! True love, rings, sweet proposals. It’s the new Straight Dope fad. I’m so jealous!
Many congratulations!
Congratulations and all my best wishes for a life filled with love and happiness!
Oh, and in order to obtain this, it might have been helpful for me to have included my sig line. Not that you’ll need it, necessarily, but… just in case, here it is.
Wow, that’s really awesome. I hope someday I’ll be able to say the same thing…
W00t!
I wish I could’ve put that more eloquently.
Congratulations!!! That’s wonderful! May you have many years of happiness together!
Woo Hoo!!!
Congrats to both of you!
Congratulations to you both
Yay!
Congratualtions!
(instead of “celebrating” you posted on the SDMB?.. Cecil should be proud he has that hold on us)
Congratumalations!
Congrats!
F_X
Ahh, yes.
My joy is tempered by the fact that I put her on a plane back to Boston this morning. But our impending nuptials make it at least a bit more likely that we will once again live in the same city.
Wishing you more laughter than tears, and more joys than fears.
Congrats
Wow! Dopers are getting hitched left and right these days. 
Congratulations spooje! I take thet yours was a long distance relationship? If that is so, I need some pointers on how to make that work to a happy conclusion, like yours did.
Well, we’ve known each other for 15 years. We’ve only been hooked up for about 18 months.
Knowing each other, and being close freinds, for so long kept us from acting on our attraction for each other but helped us out once we decided to go for it and risk.