I miss WebOS completely. I personally think it's a much better OS, hands down.
I do *NOT* miss the hardware itself. I love the hardware of my EVO - though to be honest I do have a funky miscolored bright spot on the LCD display of my EVO, it's been there since day 1. Just haven't gotten around to getting it exchanged, and I'm afraid I'll get a 2.2 unrootable phone - so I'm waiting on that.
Once WebOS comes out w/ some new sleek hardware, I may sell the EVO and switch back. It was honestly much simpler to use - very slick and quick. The synergy/universal search was awesome.