Via Vox Day's blog I found that great tool that he links to. It's Firefox only, but it installed in like 30 seconds.
I'm using it right now. It didn't work at first, because of some Atom Feed glitch, so I had to delete my blogs and have it re-find them.
I really like this app so far. It opens up and takes over the bottom part of your screen, and you can have several tabs open and browse between them and cut and paste stuff right down into it. Way cool.
I am afraid I must withdraw my recommendation. Adspell, the spell-check app I have been so enjoying in Firefox, does not work in it. Plus, it now just plain refuses to post, again. Until someone smarter than me tells me how to fix it, I ain't gonna use it no more.