When I started up City Pages blogging community in 2003, I wrote an anonymous front page blog that did exactly what you are proposing. Each day's early morning post was a mix of the best of the net and just about every linkable page of new City Pages content that had been posted since my previous blog post.
I thought Village Voice Media should have a website dedicated solely to driving traffic to other VVM sites, but mine was a very small voice in a very large media corporation where all the important people were obsessed with 2) being important, and 1) not being laid off.
VVM changed their site architecture since then, but I'd be glad to email you some samples of what we were doing. City Pages kept doing this concept after I left, but changed the concept radically a year or two ago.