As for me, I love my i600. The only accessories I have, other than what came with the phone, is a 256MB SD card and the vinyl protective skins that are sold on eBay. I would like to get a keyboard, but I think $69 is a bit much for something I would probably not use very much. I have added a number of apps. My top 5 favs are PocketTV, PocketMusic, ConnectedBits Weather, AgileMessenger (very cool if you use AIM, Yahoo, MSN, and/or ICQ), and SPVMan (PacMan for those that didn't know). I am located in Maryland (right near the Delaware/Maryland line). I would say that my phine usage is split 50/50 between personal and business. Whenever I make a sale on my website (www.GreatBigStuff.com), my shopping cart sends me an SMS to alert me of the sale. The sound I have on my phone that is associated with SMS messages is a kaching cash register sound. I guess that enough bio for the moment. Probably than most of you might even have cared to know.
I now hope that you other i600 owners will chime in with a post.
Have a great day!