GI has posted a really nice article featuring some of their writers' impressions of Borderlands. You can read the whole article online! The impressions focus on the co-op experience in Borderlands, so read up and find out what it'll be like when you finally have your own character and are playing with your friends!
"Cooperative play is bound to be a huge hit upon the game's release, and it's handled better than virtually any other team multiplayer experience I've seen. Your character, his/her level, and your entire inventory can easily travel in and out of your friend's games, and you're free to leave at any time without disrupting their play experience."