Handy tip: If you ever have a really large file to edit, Textwrangler is awesome. I've opened 1GB SQL dumps in there, and it happens almost instantaneously -- with syntax highlighting. Strangely, BBEdit and Sublime Text took longer to open the same files.
I've not tried Textwrangler, but for the 100 MB or so XML files that are the project definition for the primary system I support, Ultraedit works well.
