Modified Frontpage data model

[Matthew P. Schmidt]

Hi guys.  At JRoller we had a custom frontpage data model that fetched 
only the entries in a certain set of categories.  This was a hack and 
required us to override too much code.  Is there a cleaner way for us to 
replace the entry list coming to the frontpage theme (we're building a 
new one anyway)? 

Thanks,
Matt