TextMate
MerlinMannWishList

My big requests

• Dragging text to doc icon or tab in project view appends to target document (without change of focus)
• GUI for configuring bundles and info.plist-related stuff
• if I have a document open in a project and “open” it from the Finder, I don’t want a new window to launch (bring it to the front in its project window)
• switch wiki format to Markdown :)
• incremental search, per-page
• fast way to “Find File” in projects
• escape auto-complete across all project files
• Markdown bundle (syntax coloring, templates, folding, etc.) for foo.markdown docs
• Easy way to change the text header prepended to concatenated files
• Wizard-like tool for building snippet/macro/key setting triads (sample: one-ish step to build fave html tags, like `strong` etc.)

Others’ Greatest Hits

• print functionality (show-stopper!)
• preferences
• variable width font support
• per-document settings for font, bkgd color, etc.