I use Flock & love it!
It's like a baby sister (or something) of FF so it was the 'recently closed tabs' thing and, my fave thing, the downloads window... Originally I d/led coz of the Photobucket uploading features it has coz sometimes I need to upload hundreds of pictures at a time so I need Flock's drag and drop. Back then I was only using it for that and as back up when IE and FF weren't working... Now those two refuse to open most of my usual sites (incl. this one) so I've dumped them and only use Flock, which is sooo much faster than they ever were!
I haven't used all the features on here yet (even if I have had it for years
) but a couple of the media features (eg. friends activity for Facebook & Youtube on homepage) are really interesting.
Oh and coz it's so fast, I don't bother with all the toolbars like google that I had on IE, it's just as fast to open a newtab and go that way.... it already has the built in spell check thing, so I don't need to add it on or anything... and I think it's pretty