I've found a few sites that have techincal and parts information for some brands of watches (including some modern ones, as well):
A few other ones on the WatchCo site as a bonus!
Note: There are a few calibers on the site that are not listed on the webpage. You can try entering the caliber number in the URL to see if it there. For example, the sheet for the cal. 497 (Futurematic) exists at this site, even though it is not linked:
The sister 817 can be found by substituting "817" for "497".
The site is in German, but is easily navigated. The tech guides are in English. This site is no longer operative
You can find the same information here:
Update - June 15, 2009
Additional massive database of techical documents for many brands of watches may be found here: