I've spent all afternoon (and part of the evening! This is quite a thread!) reading this. I love that it started in 2004 and some of the OPs are already back in the states or have made the moves they anticipated a year in advance.
I still have a year to wait (stupid school teaching job!

) but after reading the thread about stuff to really think about before going and getting myself a little freaked out, it's comforting to read this one. These are some of the things that I fell in love with in my brief visits there, too. It's funny how much more sensible and *normal* the lifestyle in the UK seems compared to my lifestyle here. I've always identified much more with things there, anyway.
My favourite things I'm looking forward to are:
Public transport and no need for a car (or expensive petrol/insurance/maintenance...)
the weather
Radio 1 live whenever I want (not just in my car with my Sirius radio 5 hours delayed!)
Being outside more
real public parks- not baseball fields for kids
pubs and good beer
South bank
museums
Tesco!!!!!!!!!!!!
Hollyoaks (I'm such an addict!)
Bank holidays (and using the word holiday! Makes every day off sound so festive!

)
fun cheeses you can't get here
tea, tea and tea!
Graham Norton
Being able to visit my friends in Ireland, Spain and France on weekends!!