Thanks you two.
I'll take a look at both SimpleMU and MushClient. I definitely prefer my MacBook, but being as my job takes me out into the field on foot all day, I don't want to be toting it around. It's only my life on there, after all. The netbook is so much lighter and smaller. I don't plan to do much with it, just surf the net, check e-mail and connect to my Mush games when I can during the day.