As far as mice go, I have a kensington.com pocket mouse pro wireless for when I'm on the go, and a MX700 for LANs and when I'm home. The Kensington mouse is small, optical, and stores its wireless reciever inside the mouse when not in use! It is a bit pricy however for a minimouse, but I was lucky enough to pick it up from the campus bookstore.
I also have an Echo Indigo (www.echoindigo.com
) PC-Card type soundcard. There is a marked improvement in sound quality when listening DVDs/MP3s or playing games. Consider it sort of like a mini SoundBlaster Audigy 2.
I also picked up th FoleeMessenger16 from www.booqbags.com.
I just ordered it yesturday, so I don't have it yet, but it looks to be a great quality bag, that will fit my 5680, accessories, books, and other things I need to lug around campus. Its not cheap, but it looks to be a good investment, especially since a true roomy messenger bag is hard to find.