I thought I'd report my experience so far with the HP8500. I got the wireless version, not for the wireless feature, but for the touchscreen display. I have it wired in via RJ-45 and also have it plugged in to the phone line.
Installing the software is time consuming, but flawless. I've loaded it onto 3 machines now, W7 & Vista, and tested all, including a laptop which connects to my LAN wirelessly. Installing the s/w does not require the printer to be first connected via USB to a PC, as was the case with my Canon MX-850. This installed much more easily, and works with Vista, something the Canon sometimes refused to do. Vista & Mac drivers are on one CD, W7 drivers on another.
All functions work across the network just fine. Scanning across the LAN - no problem. Faxes can be sent as a printer selection or via feeding the sheets into the ADF or flatbed. Although I am pursuing a quality difference between the two. I think I had a setting wrong when I printed from Word.
One really nice feature:
I have an answering machine at home, set to answer after 2 rings. The HP8500 will listen to the answering machine as it picks up, listening for fax tones. If it hears them, it will accept the fax. I've tested this and it really works, and works well. I also have it set to answer after 6 rings, but that should never happen unless I turn off the answering machine.
I did not need great photo printing, but this thing is gorgeous! Prints are far, far better than from the HP2320 color laser at work. And it took fairly heavy high gloss stock, too. It is no speed demon, but it's fast enough, and appears fairly sturdy.