FYI, HTMLArea version 3 does NOT work on IE with OS X (version 2 didn't work on the Mac at all).  It works well with Mozilla, however.  I have some clients who are using it on Macs, and I just make sure they all have Mozilla.

Note that it is best to turn off the "Use CSS styles instead of HTML elements and attributes" preference, under the Composer section of Edit Preferences for Mozilla.  Otherwise you get some pretty far out style-based HTML tags that confuse other editors (and sometimes Mozilla itself).