Your reasons given for building this are exactly why I built hckrnews[1], and why Peter Cooper built hackerslide[2].
[1] - http://hckrnews.com
[2] - http://hackerslide.com
[1] - http://hckrnews.com
[2] - http://hackerslide.com
On the other hand, if you haven't subscribed to the HN RSS feed, or have deleted some of the items, then these would still provide a valuable service.
I somehow missed Hacker Slide when I looked through the Hacker News links on Resourcey. Very nifty!
How far back can you go on each site? I see that Hckr News has an endless-scrollbar-like interface, and Hacker Slide seems to cover two weeks. (Those time frames and navigational control might be plenty for most readers, but some of us are a little more obsessive...)