Hey Maven, I'm with you, I'm hoping to be moving out to LA by next May, can't wait to get out of my miniscule London Flat.
The forums for UK visas tend to focus on people who have very complicated immigration histories, or have been denied because the process for most people is pretty quick and painless (apart from the cost) so don't let them scare you.
http://www.ukresident.com/There is one form and supporting docs, and the easiest place to find all the info you'll need is the official source. Their guides are relatively easy to follow, provided you fall in to a simple category, i.e. married:
http://www.ind.homeoffice.gov.uk/http://britainusa.com/BUTMOVING to the UK is a very different thing to LIVING in the UK. One is a case of rocking up to the consulate and getting a sticker in your passport. The other is slowly unlearning to expect a good standard of living or for businesses to be set up to please you, the customer.
After 5 years or living here my OH is STILL in shock everytime he needs to get anything done - banks, phone, broadband, TV services, jobs, etc. - at the archaic and cumbersome systems in place here, not to mention the BAD BAD BAD service. My victorian flat might feel lovely and historical, but it wasn't so great the other day, when the equally ancient electrics went haywire and blew my speaker system, router and external hard drive. Things like this are the order of the day.
And then if you get here, and want to move back, and you've abandoned your PR status, you gotta stay here and go through the whole process all over again!