We created a home made brooder out of an old kitchen table.
Cardboard walls were duct taped to the circumfrance of the table top.
An infared light was suspended from the rafters.
Thin [0.7mil] plastic was hung from the rafters such that it touched the outside of the cardboard walls.
This is a very draft free arangement.
April 24th 2011 - Update - Built a bigger brooder with poultry mesh floor - dropping fall through onto a shower curtain, this makes it much easier to clean.
Here is a link to some pictures posted on Flickr.