Watch the Down at Dino's online guitar lesson by Angus Clark from Hard Rock Survival Guide: Lead
Here's a track that I cut a solo (well, half a solo) on for an album. I'm treating it differently for the most part in this demonstration. It's a shuffle, so as with the last example, your rhythmic feel is paramount to the success of the solo, and the song. Cool stuff to look out for here: double stops, triplets, mixing major and minor pentatonics.