buckworks - 2:18 am on Feb 7, 2013 (gmt 0)
good list of negative keywords
That would be a good place to start.
Working to strengthen your negative keyword lists would be some of the most profitable time you can spend, especially in the early stages, and the research would stand you in good stead even if you decided to start over with some of your campaigns.
TIP: Sometimes you'll want negative keywords that apply to specific ad groups or campaigns, but some keywords will be unwanted in multiple campaigns, or even your whole account. It can be a time saver to make shared library lists for terms that you'd want to apply to more than one campaign.
You will often want different negative keywords for search ads versus the display network, so make sure you have separate campaigns for each, with their own negative keyword lists.