You've come a long way baby
The accessories you get in the pack are pretty standard, an AC wall charging unit, data transfer and charging cable and headphones with inline microphone. But it would be really nice to have a soft case of some kind included with this I think, just to keep your baby scratch free and shiny screened for a few months after you get it.
Talking about using the OS now, there is only one real issue with it that has been the talk of every Hero owner around the world and that is the sluggishness when you transition between the screens.
Apple managed to do it pretty flawlessly, but HTC's hardware seems a tad jerky and sluggish after you open a few applications. BUT FEAR NOT! HTC have promised a firmware update that will reportedly fix the issues of laggy screens along with a few other feature fixes, so we wait with baited breath to see if this turns out to be the most awesome android phone to date.
There is a huge amount to talk about with this phone and I'm not going to go into every detail because everyone is going to want different things from this phone so instead I'm going to tell you to get your ass down to your local mobile phone shop (preferably one that carries the HTC Hero! Duh!) And have a play with it yourself.
Do all the things you want to do with it and make your own judgments about typing on the onscreen keypad, browsing the Internet, using the multi touch zoom capabilities and even have a fiddle with the Android market place... it has an application for almost everything! (The authors personal favorite being the voice recognition search tool!)
For me, however, I think this phone is the bee's knees and there's no problems that can't be fixed with a little firmware update... but then again what do I know... I'm just a gadget reviewer!