Using Yahoo IM on the Treo

What programs do people use on their Treos to access Yahoo instant messenger?

I just added Verichat, and I am having some trouble with it... it doesn't give me the "chat" icon as a possibility when I try to ping my signed-on-as-invisible buddies, who are listed as offline contacts. It tries instead to send an SMS/email to their userid at yahoo.com. Anyone found a workaround, or use a program that lets you send chat messages to offline buddies?

Also, Verichat seems to sign me off when I switch applications on the palm - is there any way to keep myself signed on while say, playing Sudoku?

Thanks...