Chris (AK4SK), the Kenwood TM-D710 has CW ID capability; it's in the crossband repeat menu, which is simple to access and set up. Although I have yet to use the 710 in UHF-to-VHF mode, I've set it several times when I was going to be out of the car with my HT. I set the HT on a particular unused frequency designated by the band plan for repeater inputs, and toddled off to see how it worked.
The first time it identified, two things happened: 1) I was so shocked that I hardly recognized my own callsign and 2) it was loud enough that it couldn't be missed by anyone within 30 feet of me.
I can see many uses for this function (especially once I figure out the UHF-to-VHF configuration); I am active in emergency communications, and having the car in a high place helping out with the signal from my HT will be a real help.
There is, of course, a caveat for the casual user: You want to set the transmit power of the 710 as low as possible (just enough to do the job). Unless you have an extra battery backup in the car, using the 710 at 50 watts output could strand you in the woods somewhere.
Kenwood did a nice job with the 710 and some others that people have told me about. Enjoy the options.
Peoria-Area Amateur Radio Club
Peoria Emergency Communications Response Team
Peoria and Woodford Counties ARES team member