I've just ordered a BB 8320, which I should have in a few days. One thing I'm eager to try out is Writeboard. I did a search here and got no hits. I wonder if anyone has tried it on the BB or OM browser and can describe how well it works.

Don't think it work for you. The required browsers for Writeboard are Internet Explorer, Safari or Firefox. I do not see where it states support for mobile browsers.

Backpack works pretty well on a Blackberry though as it supports mobile devices...

Did you try it? Even though it doesn't say it supports mobile devices, I've been able to use Writeboard on my Sidekick with no problem. Ironically, I can't get Backpack to work.

Update: I've tried it, and Writeboard works fine on my Curve.