Formatting numbers

[Marty Knapp]

Does somebody have a suggestion for formatting numbers with commas for a 
printed report? It wil have columns of data, with numbers ranging from  
small to large. The larger ones are hard to read, so I'd like to insert 
commas at the appropriate places. I can think of clunky ways to do it, 
but thought I'd ask here in case someone had already brewed up something 
nice.

Thanks,

Marty Knapp