For users of my Solaris theme, there is now a version history page that details recent improvements. The 1.0.6 update has been submitted to Tumblr and, once approved, will automatically roll out to all blogs that have not switched to the Custom HTML mode in the Customize area (if you have, you’ll need to manually install the theme again, and port your changes to the new version).
The 1.0.6 update includes support for the new AJAX notes handler which loads notes in batches of 100 from Tumblr’s server. (David was kind enough to add callback support so that I could continue to post-process notes after they’re loaded into the page.)
One other recent feature that you may not have seen is support for three custom tags on audio posts that enable you to override the metadata Tumblr extracts from MP3 files for cover art, track name and artist name. These tags also work for externally hosted audio files. I’m investigating an IE7 issue with the script, but it appears to work fine otherwise. Please email if you have issues with this or any other aspect of the theme.