I'd also recommend MI's Guitar Soloing book. It reads like stereo instructions (well, not that bad) and has some cheezy jam tracks (which are great for their intended use), but its probably one of the best over-all texts I've ever seen. Some of the riff examples are a bit blah, but others are pure gold. It really covers what you may want to know as a lead player. I still haven't gotten all the way through it. Be warned though... what seems like an innocent page with a few diagrams represents a lot of work. For example, they show the five patterns of the major scale... "here they are... (that was easy). Learn these patterns across the entire fretboard, in every key (ok, I'll turn the page in about 3 months!)".

Tom Kolb's book on modes is great too... really simple. Just an explanation of each mode, some riffs to give you an idea of how to play the mode, and then a jamming track specific for the mode you're working on. All the riffs are played at half and full speed too.

I have the "Chord Tone Soloing" book, but I haven't really got into working on it yet (I did read all of the stuff about practicing). I got worried for a bit that paper books would soon go out of fashion, so I ordered a whole bunch of MI books. Really great stuff, and very reasonably priced. I am working on their Rhythm Guitar course in addition to lead stuff... its a great book too! (broken record I guess! :) ).