There are a few people including myself that have asked this question my fiancee and I get married in May 06 we are going back to Boston April06, everyone says it depends on your individual circumstances, you can not as the American part of the couple have recourse to public funds your partner soon to be husband can in his own right if he is entitled to them of course tax credits in my case, I have been told it depends where you will be moving to ie London is more expensive so the cost of living is higher even for a couple, but further up ie Birmingham, coventry is cheaper and it gets cheaper as you go up the country.
So save as much as you can and try not to let your bank accounts go over drawn, we have put off buying anything to keep our accounts positive LOL and keep all your bank records make sure you have mortgage letter off the bank or rent book and letter off the landlord giving you permission to live in the property, lots of pics and anything that shows you are a couple, a sponsorship letter from your husband and a supporting letter stating he knows and supports you in your application to live in the UK with him, you need to do a letter also if you have lived at the same address at all anything to show you have lived together letters off friends family stating you are a couple and how happy you both are, plane tickets to show you have met each other divorce papers if either of you have been divorced at all your pass port and if your husband can not send his then a notarized copy every page has to be done blank ones also.
Also anything that shows you have access to money IE car details if it is paid off I have put my van down and paper work, I have put my house details in also as I have a fair amount of equity in the property this may or may not help but as everyone says to much rather than not enough.
If you have birthdays or anything coming up ask people to give you money for your account to show savings that would include wedding gifts bit cheeky but at least it bumps your savings up and to be honest most electric stuff wont be much good over here anyway so if you have money as wedding presents at least you can purchase when you get back.
If you have a degree then put all that in and a cv also.
I hope this has helped abit