I modded a Taisol socket A heatsink.
Basically cut out the ridge and 1cm thick cross section.
drilled 2 holes under it and now I use it for a replacement on my northbridge chipset on the mobo.
MUCH better than the little, dinky, thin heatsink that Leadtek put on it
EDIT - I've also cut out the grilling that is hindering the airflow of my rear exhaust and front intake.