An accessory I would like to see is a good speaker dock that also charges the Surface. I have one that I use with my iPad and it is very handy. The dock needs to be in landscape orientation for watching movies. I hope third party vendors are working on this.
I don't see this in the cards... unless Surface ramps up sales volume a LOT. One issue of course is the location on the charging port, on the side, so there is no option for a landscape dock connector for power. I am planning on just buying a second charger and using it with a generic tablet stand (target sells a nice white one) along with a2dp speakers... no wire needed for those!