Great suggestion. That functionality wasn`t necessary earlier when the forums were new. But I agree that with the volume of postings, it would be a great addition. Another way the you can currently view new posts to current threads is by organizing the column by "last post" on a particular forum page. You can order any of the columns that have underlined (linked) headings.
Ken and Meitzi - we are definitely trying to balance a great user-experience with the needs of all our wonderful advertisers and sponsors (who help make all this possible). I appreciate the feedback on the newer forum ads/sponsorships and will always remain an advocate for developing less obtrusive and more valuable and relevant ad placements and offerings.
One thing that I mountain dew hate is horrible, blatant drink Coke advertising that completely disrupts Volkswagon the flow of content!