I spend lots of time behind my keyboard. The last time I went looking for a new one, I found some really good reviews of the Microsoft Natural Ergonomic Keyboard 4000. It is a USB keyboard — with a wire. My last two keyboards were wireless, but I found that I didn’t move the keyboard around much, and the hassle of batteries was not worth removing that one little cord.
I have used ergonomically shaped keyboards for a long time, and find this one to be very comfortable. I appreciate the standard layout for Ins/Del & PgUp/PgDwn. I also really like the sliding key in the middle of the keyboard, which lets me scroll* through web pages quickly and easily.
* Note that the sliding key was intended to be used for zoom — not scroll. I used the instructions here to change that functionality.
