Although not about the phone itself per se.
I currently have a Nokia n95 8Gb, and not looking to upgrade... just yet. But when I do it will almost certainly be to one of the droid variants.
I can find a ton of info for the droid features/models all over from a hardware/OS standpoint. I also hook up my phone via USB to my PC daily for the typical synch/add/edit contacts, media, etc options. Those are all well and good, plenty of info about those features as well as access the tether options for internet (assuming not blocked by carrier).
But one feature that I love but didn't even know about till I started using it was a component of the Ovi Suite Nokia provides. It allows me to hook my phone up via USB and have full access to its SMS features. I can then simply alt+ tab to the OVI window to send/receive texts from my phone using my computer. As I'm very often at my computer (at work or at home) this is incredibly handy... but it's not a feature I see listed anywhere.
So in short, does any of the current droid variants have this kind of capability out of the box, or if not is there any application that allows?
If there's some application that allows access to the SMS features of a wide range of phones (droid included obviously) that would also be acceptable... and I know there's tons of "text from your PC/non phone device" apps out there, but all the ones I have seen seem to require their own number, the other person to be using the same program, or require an internet connection to some outside service/site... which are all less than useful/desirable. I've never seen one that allows a connection to your existing phone/number with just a local application.
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That said, Google has Google Voice, which can send sms from the website or from your phone.
For just SMS-ing I know a couple other programs do that and as mentioned above, there is always google voice.
Something where the only requirements are application on PC + the phone connected to said PC would be the ideal.