I have:
- Bookmarks, useful for sites I go to a lot
- StumbleUpon, but I only put it there when I'm using it.
- Imageshack, I don't display it on the screen, but I use the drag and drop feature. You can drag a picture from a folder into a text box (CF, blog, MySpace, whatever) and it will automatically upload it and tag it how you want. I have it set to display the thumbnail with tags by default.
[url]http://toolbar.imageshack.us/[/url]
I don't mind toolbars, I've got my 22" monitor, so space isn't really an issue.