http://teabass.com/super-simple-ruby-on-...

HTML Emails can be a pain in the neck due to radically differing rendering of various clients. There are a number of web-based services which cater to designers or developers for testing the results in a dozen or so various clients (and versions of the clients) from Outlook to Gmail, and even Lotus Notes.

Note that all three provide screenshots only.

http://litmusapp.com/

http://learn.awakenedvoice.com/2007/07/3...

http://video.google.com/videoplay?docid=...

Haven't looked into this much, but it looks similar to Google and Amazon's offerings:

http://www.gogrid.com

http://www.openajax.org/runtime/wiki/2D_...

http://www.tinybutstrong.com/

http://www.bird-malaysia.com/

Interesting lightweight OO development platform:

http://www.noloh.com

Not sure about the accessibility of its URIs, but I'll look more closely.

http://googlemapsapi.blogspot.com/2007/1...

http://culturedcode.com/things/blog/2008...

http://wiki.macromates.com/Main/Subversi...

http://code.google.com/apis/ajaxlibs/

http://www.mamp.info/en/mamp.html

http://www.bluestatic.org/software/macgd...

http://piwik.org/

http://www.webmonkey.com/tutorial/Get_St...

Very funny. I wish it was like this!

http://www.thewebsiteisdown.com/

Fairly interesting:

http://www.adaptivepath.com/blog/2008/05...

http://24ways.org/2007/supersleight-tran...