In my 12 team, 5x5 roto league, my closers are Kolb, Graves, and Chacon. In Yahoo, the latter two are eligible at SP and RP. Seeing this, I dropped my end-of-the-rotation pitchers and picked up K-Rod and Lidge.
Their effect on your team isn't noticeable unless, like last week, they vulture a win or a save. But over the long haul, they're great.
I know to take projections with a grain of salt, but combined, Lidge and K-Rod are on pace for:
175 innings, 280 Ks, an ERA around 2, a WHIP under 1, and a handful of wins and saves.
I'll take that over a Mike Hampton (who might only nab a few more wins, but with higher ratios and less Ks).