Currently I use "Shipping By Order Weight", and my configuration is the following: http://www.screencast.com/users/cwmagnus/folders/Jing/media/5cb7c402-a069-477b-ab52-e961e404739a
click edit and change the name of 'by ground' to something that suits you best - i use our national postal service so i've called it 'Royal Mail'. In the box underneath, put a description you want your customers to read - i put 'Orders to UK addresses will be sent Royal Mail 1st class on orders up to ...............'
then save it and go to
configuration -->shipping-->Shipping Rate Computation Methods and click 'edit' Shipping By Order Weight
at the lower part of the page, you will see
Adding new values: Select shipping method: a dropDownList containing all of the shipping methods you have created - select the one you want to use and input the relevant information (its self explanitory)