Sublime Text 2 is a text editor for OS X, Linux and Windows, currently in beta.
I'd love to be able to define alpha channels in my color schemes, preferably with the TextMate convention.
API to make it possible to add tooltips in the editor http://www.sublimetext.com/forum/viewtopic.php?f=2&t=2670)
A tooltips API should be thought to make it possible to have function call tips with integrated documentation added by plugins and perhaps color for syntax highlighting. Also tooltips could be made to render graphics or colors (as for instance to make it possible to see the actual color when one hovers a CSS color in the code)