Jeff, firstly kudos on continually looking for ways to improve the site. Nice of you to keep adding toys to our playground!
In terms of a wishlist, I would love to see an version of the website formatted for mobile devices (esp. iPhone)- although I should note that the current site actually loads quite quickly on a mobile. The second suggestion would be for upgraded forum features, such as the ability to send personal messages, edit posts, etc.
Of course, its easy to ask for extras when its someone else doing all the work, but to me these would make more of a difference that Twitter. Leave that to the teenage girls "OMG did u c gr8 SifAut on Ebay with BIN. Is it 4real? LOL