Axis has a knack for making small network cameras, and it claims that its latest delivers the best image quality "in its class" (whatever that is) and that it's the world's smallest megapixel (1280x1024 pixels) network camera. Given the adorable name of the 207MW, this camera comes with both wired and wireless (802.11g) interfaces, so installing it should be an simple feat regardless of your network's infrastructure. These tiny network cameras are usually aimed at [crazy] people who want to keep an eye on their homes while away 24/7. Love thy neighbor.
Expect to find this little gem online for just over $500. Perhaps your money would be better spent installing a moat around your house? I imagine it'd offer the same amount of protection, especially since all this camera would let you do is watch the burglary in real time.