Anyone have a projector they use and love? This would be for hosting presentations, not for a home theatre.

I've heard about ones that can run slideshows (Powerpoints?) off of a USB drive. This would be a huge help for us since we have to lug a big laptop to our seminars now.

I've also heard about ones that magnify the picture so you can have the projector 2 feet from the screen but the whole screen filled up. Unfortunately I don't know what the names for these features are so it's hard to search for one.