Finally, WordPress now offers a better search engine for its plugin directory. It is using Sphinx right now. But, it does not search plugins by authors and tags. It only reads all information from readme.txt file which is delivered in every plugins uploaded to directory.
Another improvement — well, I think I should call it “feature” — is that WordPress.com is now supporting comment threading feature. This feature is included in the core if you’re using self-hosted WordPress 2.7.1. Since WordPress.com seems already upgrade to the latest version, we can now use this feature also. Just go to Settings and choose Discussion from your WordPress.com dashboard.