I've been patiently waiting to upgrade to WordPress 2, but don't want to take the leap until WP-Cache is updated.
The latest version (2.0.17) was released over 9 months ago (before WordPress 2) and the developer seems to be ignoring requests for an update, so I think he may have abandoned it.
With a high-traffic site like mine I need more than the simple caching of WordPress 2.0, but I'm worried about the unpatched security holes in my 1.5.2 install.
Are there any developers willing to take control of WP-Cache and get it working with WordPress 2? Or is there a suitable alternative?