The ones posted, not the attached ones although John may chime in on that as well. The ones attached are less critical IMHO however you should warn viewers in your post when they're big.

The key problem is the usability of the forum is impacted for viewers especially when their screen size is limited. My screen's at 1280 wide and I still have to scroll to the right to use it (since the reply links are on the right side of the screen). The general recommendation has been to keep pics at 800 (or IMHO even 1024) wide.

The other thing affected is download times. On the road, those 350MB images can get painful especially when your viewing them on a cell phone.

Thanks.