I decided to update WordPress to 2.0.1 and only have found an issue with one plugin (PageNavi). A huge thanks to the WordPress development team who have once again, released an easy-to-update release. As always, make sure you backup your WordPress install before upgrading.
I also updated my Tasks Pro install yesterday to 1.6 and just as with WordPress, the upgrade was painless. Alex King has done an tremendous job with this software and I always look forward to using it. (I first started using Tasks in early 2003)