[U2Lynne]

Which browser are you using? When you click on an attachment from a vBulletin site (that is the forum software we use), it should ask you what to do with the file. At least, it does for me in firefox. You could also do a rght-click Save As (or apple+click Save As) and see if that works for you. You really should get in the habit of saving the torrent file to your hard drive instead of just opening it up. Once you download the torrent file, double-click on it to start it, or drag it over the application icon in the dock.

Yes, BT 4.4.1 works with torrents from here.

I prefer BitTorrent over Tomato. But, I prefer Azureus over both of those.

Yes, you could run two programs at the same time, but if you run it on the same torrent file, it will confuse the clients. I don't know why you would want to run two BT programs at the same time though.

Yes, you can resume them, but you may lose some data.