twhirl works for me... it installed on the menu at internet/instant messaging... the only bug (and its a linux thing, not pclos) is that it won't remember my passwords. I tried tweetdeck awhile back but iot was too buggy... but it's probably time to try again
air and twirl both install under the hidden directory ".appdata"... I'd delete this manually before trying another install
EDIT: oops... spoke too soon... apparently one of my recent updates took out twhirl or air.... gotta check into this