Trebuchet.Com  "Dedicated to the art of hurling". Mostly a retail/commercial site, but also provides a message board, events calendar ("For the hurling community") and a links page. Has a some really cool toys for sale, including a trebuchet simulator... also videos, t-shirts, books, etc., etc., etc.....

NOVA Trebuchet Page  "The plan: NOVA and a team of master builders from England, Germany, France and the United States will reconstruct one of the most destructive of medieval weapons ever made: a giant trebuchet." This is perhaps the best siege engine documentary program ever made, and was the impetus for our building of the WarWulf.

Experimental Reconstruction of a Medieval Trébuchet  Okay, keep in mind that this was written by a medieval history scholar... don't expect any car chases to liven things up. It is, however, an excellent account of how to construct an historically accurate siege engine, although a little light in the pictures department...

Legion XXIV Trebuchet Page  Romans with siege equipment... bad day.

LEGO© TREBUCHETS!  The name says it all. Build your own LEGO© trebuchet, and go teach Barbie© and Ken© a lesson. Watch out for G.I. Joe©, though- field mortars have a better range than a treb. Not to mention a big BOOM at the end...

To Build a Trebuchet  "The trials and tribulations of building an SCA combat siege weapon" Site has a lot of good advice, a nice picture, and plans for building a traction-powered trebuchet. As an added bonus, it's also SCA legal (at the moment) in case you have any insane ideas about crewing an immobile siege engine in the midst of melee combat....

Paper Trebuchet  This is a sweet little trebuchet card model which actually works! Site includes downloadable patterns and detailed instructions to create your own cellulose terror. WARNING! This ain't no paper airplane. Patience, sharp scissors and a background in model building would be extremely helpful. As would a physics degree.

The Physics of the Trebuchet  Speaking of a physics degree... This is a terrific site if you're doing some type of report on siege engines, if you're building a treb from scratch, or if you simply enjoy physics. Sicko. Gives a good bit of info that'll help you work out your counterweight-to-throwing-arm-length problems... or you could just experiment.

Floating Arm Trebuchet  Good site with construction photos and blueprints/designs for a floating arm trebuchet. These things require a bit more engineering than a "traditional" treb, but the results can be well worth it...

Dan Becker's Treb Page  No idea who Dan Becker is, but he's put together a nice page with some detailed instructions (and nice pics!) on how to construct a 1/6 scale model trebuchet. The site also has instructions on building a toothpick treb as well, but I don't plan on laying siege to any termite colonies anytime soon. Note: The instability problems mentioned with Dan's model can probably be solved with outriggers...

Seige-Engine.Com  Site run by a group called Team Tormentum, who build, demo and sell a variety of siege equipment. Nice pics of their machines, but no blueprints or designs. The engineering section is definitely worth a look, covering pesky problems like triggers and slings. This site can provide a lot of ideas and help for the experienced siege engine enthusiast.

Experiments with Trebuchets  Good site which shares one man's experiences with building trebs. Everything is covered quite well. He even provides a number of mathematical formulae for determining sling/arm/weight ratios. With a little imagination and a tiny bit of additional research, this page should serve as a good tutorial for the first-time treb builder.