I had stopped reading Slashdot a while ago, as Reddit had started having more interesting/new stuff. Things have changed between then and now: Reddit has morphed into a sort of dumping ground for all kinds of crap -- witness the number of 'Vote up if you hate...' and 'Dear Reddit, I wrote a new JavaScript Sudoku solver. Tell me what you think' posts that make it to the front page. Slashdot continues to have more focus, with a much higher signal to noise ratio -- no doubt owing to more editorial control over the content. It also continues to be one of the few places where the quality of the discussion consistently exceeds that of the content.
To be fair, Reddit does provide some value with the NSFW^H^H^H^H funny pictures and videos, but a good source for the latest news? Not anymore.