I don't use a microwave oven myself, but the following have some pictures...   
http://www.instructables.com/id/How-to-remove-the-bleeder-resistor-in-microwave-ca/
http://www.instructables.com/id/Build-a-Microwave-Transformer-Homemade-Welder/
http://www.instructables.com/id/Small-110-volt-arc-welder-NYDG/

@ Dr GT

I stripped an old microwave last year and decided to look into the safety aspects first. It is not just the Cap you need to worry about. Have a read of the Health hazards on the wiki page 2/3 down
http://en.wikipedia.org/wiki/Magnetron

QuoteSome magnetrons have ceramic insulators with a bit of beryllium oxide (beryllia) added?these ceramics often appear somewhat pink or purple-colored (see the photos above). Note that beryllium oxide is white, so relying on the color to identify its presence would be unwise. The beryllium in this ceramic is a serious chemical hazard if crushed and inhaled, or otherwise ingested. Single or chronic exposure can lead to berylliosis, an incurable lung condition. In addition, beryllia is listed as a confirmed human carcinogen by the IARC; therefore, broken ceramic insulators or magnetrons should not be directly handled

The cap will kill you quick but lung cancer is a patient beast

Take care removing those magnets

There are lots of good parts in microwaves, definitely work taking apart.  Just watch for the high voltage -- it's lethal.

-Feynman

@Dr GT
I use insulated screwdriver to discharge the caps.  Just as a heads up, they will make a spark and a loud pop if they've got a charge in em.   

Thanks for the info. Ive been shocked by a smaller cap that was in a home audio amp when i was like 9(trying to figure out what was wrong with it). I touched it and next thing you know im 5 feet back on my ass and seeing black and white! Of coarse i came to after about 5 seconds.

My favorite 2 things from microwave ovens are the Transformer and the diode.
The diode in some of them is a 15kv 1amp diode.

The transformer comes in handy for many things.
Try grinding the weld off on it and then take it apart.
Take 2 transformers apart and mount the thick wire coils on one core.
This will give you a really great isolation transformer.

Has anyone seen plans on how to use these transformers to make a MEG?