The CPSkins Autoinstaller has been updated on Thunder and Lightning.
Full Listing: http://www.cpskins.com/autoinstall.php
Newly added:
CREloaded - http://www.creloaded.com/
Joomla - http://www.joomla.org/
Lazarus Guestbook - http://carbonize.co.uk/Lazarus/
Mediawiki - http://wikipedia.sourceforge.net/
Vanilla Forum - http://getvanilla.com/
Remember that Fantastico is on all servers and is generally more current with mostly the same, if not more, scripts than the Autoinstaller. Cyclone and all new servers going forward will feature only Fantastico as it's a better supported, more automated solution.
Fantastico Script List: http://netenberg.com/fantastico_scripts.php
On a side note, I found and installed Lazarus Guestbook for a site a few weeks back ironically. Great little script!
-Jason