I'm always looking for the works of a particular painter when I travel, and a website called the Artchive was a great help in pointing me in the right direction. It's a fun site with links aplenty to online images.

Do you know of another website that lists or links to special exhibits and permanent collections for museums around the world?

http://www.antiquesatoz.com/artatoz/museum.htm

Whenever I Google a painting or an artist,

http://gallery.euroweb.hu

will come up in one fashion or another.

And I think that it's quite comprehensive.

Most museums have their websites. If I need to locate a piece that's at a specific museum, I use that website. If that fails, I Google.

Burlington Magazine features a pretty complete list of art exhibitions:

http://www.burlington.org.uk/calendar.php

artcyclopedia.com is great!

http://www.wga.hu/index1.html
someone recently mentioned seeing a Bernini's painting, (being surprised he also painted) here you can see them.

I don't have much to add, except that I also use all the above websites mentioned.

I also check individual museums' websites and look at their permanent collection and also current/future exhibitions.

On my recent trip, there are 2 more websites I found useful (but only applies to Dutch & Flemish art and Vermeer):

http://www.codart.nl/
Very comprehensive website showing where all the Dutch & Flemish paintings are located in the world. Plus current exhibitions.

http://www.essentialvermeer.com/
Also a very comprehensive website, on Vermeer mainly. It lists the locations of all Vermeer's paintings, as well as any exhibitions on Vermeer's or his contemporaries.

Yes! Artcylcopedia! Not Artchive (although that one's okay, too). Thanks for the memory nudge.

And thanks to you all; I've added a few bookmarks to my favorites list.