Said The Fist:
Im using the newest version (7) for photoshop on os x ...
I've seen the save for web deal but havent tried it yet....Ill give it a whirl....
Decrease the resolution to 80dpi or so. I'd guess that you've maintained the high resolution. Given that web images don't get displayed much about 72dpi (?), it doesn't make a bit of difference if your resolution is 300dpi.