only by using the mobile interface or turning on tPlurks IM bot and running gTalk/AIM or somesuch on your Berry

plurk.com/m, IM, or setup a ping.fm account and you can sms your plurks in.

there is not blackberry plurk client yet though.

well, ping.fm sms if you are in the US. Not sure you have that option outside the US.

skraggy: not yet

just use the web browser on the crackberry.