What you need.

A bird box

A web cam

Enough USB cable to run from the bird box to your PC.

Web Cam software.

What I use

The bird boxes

Where it gives the longest measurement for the back, I upped that to 300mm to allow for the camera. I fitted a false ceiling, with just a hole to let the camera peak through.

I drilled a hole through the back, and through the wall, to let the USB cable through, and I put a piece of lead on the roof, to keep it all watertight.

The Web Cam.

Make sure the cam is a proper infra red camera, there are a lot of cheap copies out there that say the have infra red LEDs but are actually bright white lights.

The Cable

If the distance required is more than 5m you will need and amplifying USB cable otherwise standard USB extensions will do.

The Software.

I use Easy Free Web Cam (Others are available) http://www.easyfreewebcam.com/index.html

This program loads pictures to a web space (supplied free by them) or to a specified address. It also downloads a picture stream to your IP address. I have incorporated this into my own web pages. I use a hardware firewall and needed to configure this to allow inward traffic to my IP address.

Total cost for the project was less than £50.
There are a lot of kits available but a lot seemed to be based around a video camera rather than a web cam. Using a web cam seems the best solution for publishing to the web. It may be too late to set up for this year but why not set one up for next year and we could start up a network of birdie cams.