I usually avoid adding online secondary sources (most of them are so cursory and unreliable, in my experience) but this one has some substantial information on obscure topics that students often struggle to get information on, such as Bronze Age Mesopotamia. They'll definitely need to be careful with some of the details though and corroborate any information they use.
An excellent list of sites related to Ancient History, focussing mainly on the Classical West and the Near East. I wonder why the Chinese and Indians and others still don't count as 'Ancient History' to most people? A great collection, though.
This is a flickr group devoted to images of ancient sites, artefacts and churches. They are making an effort to make sure that people correctly tag and date the images so might be useful for you. There are squillions of flickr sites for history images - I won't save them all to the group. If you're looking for images though for your classes, perhaps take a look...