Edit+ (editplus.com) is by far the best text editor I have ever encountered.
It has a cost of about $30 if you purchase it, but you can use it forever if you are willing to click the "Yes, I know this is a demo" button each time you start it. It is a full version demo with no time limit. I suggest you purchase it if you like it.
Strengths:
Extremely intuitive for working with text, great shortcuts, drag and drop, easy to be very productive very quickly. Can open remote files via FTP for editing, has the best search and replace I have ever used, regex support, and REALLY GOOD spell checker. Very customizable, easily configured, can share configuration through their website with other users, recognizes most programming languages, etc. Works great with multiple files. I used it mainly for php web development, but it's really useful for search and replace and working with regex, so I often find myself using it for data massaging, and other large volume text manipulation projects like generating sql statements from the contents of a spreadsheet, etc.
Weaknesses
As a text editor, this has no weaknesses, but if you are looking for an IDE, there is no code folding, debugging, etc. Very sophisticated text editor, and doesn't try to be anything else.
Update: It does have code folding now! I just grabbed the new version - now it is the best++ text editor.