I do enjoy the competitor analysis and keyword research on SpyFu. It's been a great tool to bring into meetings and present to clients to give them an idea of what they should be ranking for and what a realistic ad spend would be.
SpyFu + GoConvert
Use GoConvert and SpyFu to maximize the ROI of your sales and marketing spending. Enrich information in your SpyFu account, improve contact and deal information, and start visualizing marketing and sales performance. GoConvert works around the clock to automatically fill in missing data. Your insights get better all the time.