TUAW picked up on a press release that I sent out a couple of days ago and now traffic has skyrocketed! So just one tip. Be persistant and you will eventually be rewarded. I have sent in total 4 press releases to TUAW in the past year and finally got picked up. The Unofficial Apple Weblog (TUAW) is part of the Weblogs, Inc. Network — a network of more than 80 blogs.
Congrats on the traffic boost =) My traffic is driven solely from Google, MSN, and Yahoo! right now, with a couple link exchanges that bring in some traffic.
I don't sell anything on the site. It is a classifieds website where visitors post their own ads. I actually tried the ecommerce thing a year of so ago and didn't have any luck.