Here is a list of many helpful sites with information on pulse jet engines and other science & hobby topic:
PulseJetEngines.com YouTube Channel
Click Here to check out our youtube channel for lots of informational videos, tutorials, and more!
http://www.youtube.com/becktechnologies
Pulse-Jets.com Discussion Forum & Website
A great site with tons of information and a great forum and message board for people to discuss all kinds of interesting things from pulsejets to turbojets and rockets, as well as tools and construction techniques.
Hobby Pulse Jet Project Pages
Andreas Sunnhordvik’s Lockwood valveless pulse jet project page
http://home.no/andreas.sunnhordvik/English/mechanical/valveless_e.htm
Popular Mechanics article describing how to build a small pulse jet with a few basic tools.
http://www.popularmechanics.com/home/how-to-plans/metalworking/how-to-build-a-pulse-jet
European site dealing with various RC pulse jet powered airplanes
http://www.airtoi.com/pulse.htm
WikiPedia Articles
Pulse Jet Engine - WikiPedia
http://en.wikipedia.org/wiki/Pulse_jet_engine
Pulse Detonation Engine – WikiPedia
http://en.wikipedia.org/wiki/Pulse_detonation_engine
Ramjet Engine – WikiPedia
http://en.wikipedia.org/wiki/Ramjet
Scramjet Engine – WikiPedia
http://en.wikipedia.org/wiki/Scramjet
Turbojet Engine – WikiPedia
http://en.wikipedia.org/wiki/Turbojet
Rocket Engine – WikiPedia
http://en.wikipedia.org/wiki/Rocket_engine
Other Science Links
NASA
