Smultron
2009-01-06 UPDATE: Smultron is dead; long live Smultron. I just visited the Smultron website, and the author has decided to discontinue development of the project.
Other than the application icon they use, Smultron looks as Mac-like as any text editor I reviewed. While I'll be using Komodo for editing language files (CSS, HTML, others), I'm currently using Smultron as a plain text editor instead of TextMate, and so far, I like it.