I've played with this for 5 minutes, and already think this is exceptionally well-designed. If I had seen this before I purchased Textmate, I probably would not have bought it.

OS X really needs a good FREE Cocoa-based editor. Smultron so far is the only one I am aware of that currently qualifies. I don't know why, but I just don't like how it works. This, however, I took an instant liking to. The tabs, the project drawer, the easy customizations, all made working with it completely intuitive. I didn't have to read any directions.

A few things that would improve it (I apologize if these are present and I haven't yet found them):

1. Ability to turn off text anti-aliasing.

2. Ability to fine-tune the color scheme in the syntax highlighting. I like a dark blue or black background, and some things are hard to see in the default color scheme.

3. A command-line tool to invoke the binary.

4. Programability, so I can code stuff like extra commands to open an iTerm session in the directory corresponding to the file displayed in the frontmost tab, etc.

Overall, I am extremely impressed.

Please keep up the good work, and please keep it free.