iPAQ H3950 Accessories

Hi, I'm a veteran PC User, but I've never owned a PDA, I'm getting the H3950 given to me and I plan on using it around the house, email surfing etc, possibly out and about at local WiFi hotspots. I was wondering what sort of capabilities the iPAQ has, and what accessories are available/recommeded, for instance, I'll need a SD WiFi card.

Also, I've noticed that there are only a few keys on the front on this device, are they programmable for PocketPC games etc?

Any hints or tips are welcopme, as well as point me to some decent reading material on the topic, thanks.

One last thing, which OS is the best for this model?

Oh, and hi...