Gilmour's best solo is on Comfortably Numb, hands down. However, there are numerous other solos that are entertaining, exciting, exhilerating, spine-tingling (my fav kind ), just plain fun. My fav solo by Gilmour is on Pigs (Three Different Ones) which is the highlight of the Animals album for me. Others include:

Dogs
Time
Money
Any Colour You Like
Shine On
Echoes (all of those live versions are awsome!)
One of These Days
Fat Old Sun(just discovered this song, really like it!)

There are many others....David Gilmour rules!!!!

Led Boots