The file sharing and connecting to samba servers functionality would be a lot cooler if it didn't give impossible errors like "An error occured - error = -5023". Or error = -47. WTF?! -47 is impossible to search for too. (Guess how often 47 shows up in your average mailinglist archive).
They both meant that I got the password wrong when I tried to connect to the other computer, I think.
My dad is visiting and I was trying to copy some photos from his laptop to mine so I could put them on a CD for backup. Yes, in the end we did succeed, but I'm not sure that my demonstration of how cool OS X is at connecting to other devices was so good.