I asked before if I could sync with Yahoo. I was told and saw that that was not an option.
I upgraded the software for the BB and the Desktop Manager. Yahoo is now listed as one of the Intellisync options. I tried it and it worked.
I have AT&T / Cingular.
Blackberry 8800 v220.127.116.11 (Platform 18.104.22.168)
Blackberry Desktop Manager version 22.214.171.124 (April 26, 2007)