I've been using Macs since 1985 (or maybe it was 1984...) and was sorely missing the Mac's traditional rounded screen corners in Leopard. This program does exactly what it claims -- rounds the menu bar corners in OS X 10.5 -- while using very few system resources. It appears to consume virtually zero CPU cycles and, after running for a couple days, is currently using less than 1MB of private memory (7MB of real memory) on my PowerBook G4.
Thank you for this excellent little utility!