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Hi there, Yes affiliate links (widgets etc.) should be no-follow there was a good few penalties floating around for this. Regards to the "paid links" if your doing all white-hat then yes they should be no-follow but really this a bit of a grey area and down to a bit of personal choice. I tend to follow links like this (with in reason) what a good idea can be is to have one main follow link (e.g.on home page) and if you have site wide links make them no follow. In theory though Google doesn't like "paid links" but you will find a lot of people "bend" the rules a bit.  Unless you have hundreds of links a think a few links from sponsors won't do you any harm and as long as its not site wide follow links I would let them sit as follow links but if you want to stick to the guidelines (precisely) then they should be no-follow. Hope that helps a bit