I'm trying to figure out which files used by Bitcoin-qt relate to my personal "accounts" and which only relate to the blockchain and such. I've read the data directory wiki article (and the Stack Exchange post it links to), but I found parts of the explanation somewhat less than enlightening.

Obviously I know what wallet.dat is, and I know that's the only file I absolutely need to back up, or copy if I'm moving to a new machine. But does it contain all of "my stuff"? Like the names I've assigned to certain addresses and such?

I'm also interested in the reverse situation. Say I want to set an acquaintance up with a ready to go bitcoin-qt install and save him the annoyance of waiting for it to sync. What's the minimum I can copy and save him a bunch of time. Are just the blk*.dat files enough? And conversely, is there anything other than wallet.dat that I should definitely not copy? Since (hypothetically) I don't know him that well, I would want to ensure no trace at all of my personal bitcoin activity is left behind.

Sorry if this is all a bit noobish, but I've looked around and I haven't found a really clear answer anywhere.