You can also move to the UK if you are the spouse/fiance of a citizen, have parents/grandparents who are citizens of the UK or the European Union.
I'm not an immigration attorney of course, but it is much more difficult to move to the UK for those looking for work here than for anyone else I think. You must find an employer who is willing to get the permit, which involves fees for them, and they must prove that they needed to hire you because there was a lack of employable citizens who qualified, etc. There are fields in which there is a shortage, I think you'll find them on the website above or else on
http://www.uk-yankee.com/career.php, there are some links to Shortage Occupations and Highly Skilled Migrant Worker Program. I hope that helps some.
If you're determined to move to the UK, you'll find a way, it's not always simple. Have you visited previously? What makes you want to move here?