Upgrading to WP 2.0 has been quite eventful. I installed it this morning. And when i began reactivating the plugins, the site disappeared for the better part of the day. and it required whole jumps of logic to get it back again.And the process of logical deduction was nowhere as calm or ration or unemotional as it sounds here. I didn’t know that i knew so many languages 🙂
The simple thing to do if your site does disappear is to remove all the plugins – delete them from your server. But remember to have a back up of your site before you do so. And install them one by one all over again, depending on their compatibility.
WP2.0 compatible plugins are found here

Can’t comment too much about Duke (all WP versions are named after jazz musicians) – except that its inbuilt spam catcher is quite nifty. Akismet has already managed to catch a bunch of spammers for me. And the GUI seems a lot more intuitive. It has this really good feature for import from other blogs. If only – this feature was available 6 odd months ago.