Our friends from Czech Rep. have put together this online collection of events and personalities of the Thirty Years War: http://www.30letavalka.eu/?lang=en
With interactive time-map and a timeline, it is a wonderful source of information for all Thirty Years War enthusiasts. It´s far from complete and it´s focused mostly on Central Europe, but it still offers tens of contemporary portraits, city maps and vedutas, battle plans, leaflets, etc., all with reference to original location, notes, etc. Pictures are zoom-able, so you can discover all those wonderful details. And the website has EN / DE version.
I´d give big kudos for putting this project together.

Just visited that site. The engravings look wonderful.
And, by the way Radovan, what's a veduta?

Hi Shahril, veduta is basically a picture of a cityscape (painting, print), showing the whole town, or its part. AFAIK it was popular in 16th-18th century and it´s usually very realistic, so it gives nice picture of topography of contemporary towns and their environment.

Am I wrong or it is just possible to see the prints as middle sized thumbnails? This website looks attractive but looking at just thumbs would be pretty frustrating.

Bruno, you can see zoomed-in details by moving the mouse over the picture.

Bruno, I´m using Firefox. I did not know it does not work on some browsers - thanks for pointing this out!