Meeting Bono twice was awesome, and being one of the first to hear American Prayer, sitting in the first row, was amazing (even though some people hate that song, it made a lot of people cry...)
As for actual items, I'm not a big collector and all my bootlegs are just CD-R copies or mp3 concerts, but I do have an UABRS t-shirt from 1983/4ish, size small. I love it b/c it fits! All the t-shirts on eBay are too big, but it fits great, and yes I wear it all the time. I don't believe in collecting good stuff and just keeping it packaged forever, that's no fun. I'm not sure if it's rare, but I've never seen it before and at the big bash in Cleveland, a guy offered to buy it for "any price" I'd name. I also have a Rattle & Hum CD that looks different than everyone else's and I still haven't figured out why. My aunt bought it used from eBay so I don't know what country it came from.