Homebrew PCBs

Hi guys,

Later this year (perhaps next year or whenever I get my machine done), 
I want to give isolation milling a try.  At first I thought a small 
end mill would be the tool to use, but the more I thought about it, I 
suspect that is not the case.  After thinking about it further, I 
believe it would make more sense to use a "pointed" tool shaped like 
a 'V' or something. Does anyone know of some sources for the tool bits 
that work good for isolation milling?  Primarily, I would like to see 
some detailed photos or drawings as I would probably attempt to grind 
my own - seeing as Stefan got me thinking about that now ;-)

Thanks

Chris