I use McAfee Spam Killer on a Pc at home. It checks my mail messages and pulls what it id's as spam from the mail server. It checks about every 10 minutes, so the timing is about right for when the web client checks my mail. I am getting about 95% of the spam filtered out this way. Plus, when I download my messages on Outlook, there is little or no spam ther.
I know Norton offers a spam reducing program also, so that could be another option.
I tried the Desktop redirection software and hated it.
Blackberry Storm2 (Verizon)