Donte Stallworth is such a sleeper he's in a coma. A lot good ones on this thread though...
I'd throw in Penny/Coles, Miller, Cooley, Matt Jones (although the hype has pretty much killed that at this point), Warner, Galloway (not a superhigh upside, but should be decent this year), Ricky Williams (most likely starts getting showcased right around the playoff run).
My super silly sleepers of the year
: Mushin & Stephen Davis. Mushin blows up this year & finishes in the top 15, Davis stays healthy (well, healthy for him
) and finishes in the top 20. You heard it here first...if it turns out to be wrong I'll go back in 10 weeks & edit this post.