Yes, I do. I have an HTC S620 (aka: T-Mobile Dash), which is the device _I_ was on the fence about getting, as I already had my N800 and love it. Technically, it is possible to tether the N800 to the Dash, but I haven't made it pretty yet. Essentially...

1) Do once; create "dummy" AP to connect to
2) Start "Internet connection sharing" on the Dash
3) run "pand -c xx:xx:xx:xx:xx:xx" to connect to the PAN AP
4) either "udhcpc -i bnep0" or statically assign an IP to the bnep0 NIC, and set a default GW
5) ensure valid DNS in some fashion
6) Enjoy!

There are apparently ways to get this process into the GUI, but I haven't done them yet. It definitely would be nice if you could just use DUN like normal phones.