Would it be possible to do a sort of semi-reblog? Like on RSS feeds, where you only get the first few lines and then a click to the original post? A lot of what I don't like about reblogging features is that the OP isn't getting the clicks/impressions/views on their site or blog. If there was a method of truncating the repost with a pseudo-cut-tag that leads back to the user's original post, I think it would bother me less.

Alternately, syderia's suggestions for notifying the original poster is nice. That is one thing I do like about Tumblr's reblogging system - you can see a list of who has liked/reblogged a post. (Possibly a notification system would require a "daily digest" email process depending on number of reblogs, though I have no idea about the coding cost for something like that.)