Wirelessly posted (8300)
Multiple apps. Or the m.twitter.com as far as I know no app supports multiple concurrent sessions.
Yatica, socialscope, twitterberry are a few more you could check out, none are that "light-weight" size wise though
Love the 9000!! It's everything I wanted (minus enough ON BOARD memory)!!
<-9700 ---! more memory! small screen&keypad :( ->