I once got a (legitimate) pleading that my landline and e-mail had been monitored after 9/11. My husband is an Indian citizen and was here on an H-1 at the time. Apparently they’re supposed to notify you after the fact if you’re not considered suspicious.
Other than that, not much.
I live and work only yards from the Canadian border, and there have been some significant changes. Up until about 2004 I would rarely have thought twice about going over there to get something at Zeller’s or Canadian Tire or just to have lunch over there on a weekend. Now, forget it. With the new restrictions the border crossings are taking 30+ minutes each way on a good weekend. You really need to make a day out of it, rather than just planning on going over there quickly and back. I also used to run up to U of T for various research materials, and that’s become a considerably more difficult trip now.
Some roads, bridges, and interchanges have been closed around here for security concerns–some to protect the local power authority, others to allow for changes to border crossings. One bridge I liked to use when the other bridges were clogged is now only open if you have a special pass (which I should be getting around to, but is a pain).
In general the border feels more like, well, a border. It honestly didn’t before, when the border guard would ask you an innocuous question and wave you through without even bothering to see your documents. Now there are all kinds of cameras, search dogs, radiation detectors, and the like. You don’t feel particularly welcome coming back to the States anymore.
Other than some minor inconveniences at the airport (on the rare occasions that I’ve flown), not at all.
and then they came for my slippery slope, and I said nothing . . .
Oh, sure there is. I dealt with INS before 9/11, and I’ve dealt with USCIS after 9/11. I’m sure you can guess which was more painful.