My goodness. I'm a little surprised at some of the replies. I've always been told "search is your friend" and have found it often pays-off

They may be somewhat hidden but a search for the word tips in BOTH Articles and lessons found a number of videos as follows:
Hammer-Ons
http://www.totallyguitars.com/free-guit ... hammer-ons
Pull-Offs
http://www.totallyguitars.com/free-guit ... -pull-offs
Hammer On Pull Off Combinations
http://www.totallyguitars.com/free-guit ... mbinations
Hope that helps!
♫ Ken ♫