Could someone please let me know if it is possible to use a Canon GL2 and record direct to the hard drive of a computer through firewire?
With the right software, yes.
I found out that on the Mac, you can do direct to hard drive recording using iMovie 4+, Premiere Elements 9 and 10, and Adobe On Location.
I'm not 100% sure the GL2 has HDMI out, but if it does, it would be th best ay to record to a Mac using an intensity card or shuttle. In most cases, using the HDMI port out on a camcorder gives you uncompressed 4:2:2 data.
Hope this helps