If you run in a browser older than Firefox 2.5+, Safari 3+, or IE 7+, you're going to lose pretty much all of the advanced functionality of the new GMG. However, you'll still be able to browse the website, post on the forums, etc. Just the new AJAX search features, JQuery sortable tables, and new content submission system. For content submission, I'm looking at a peer-review system where forum moderators get an RSS feed of the latest submitted content. They can either approve, edit/approve, or reject each content submission. This will drastically cut submission times, and also improve the quality of content submitted here.