Endtroducing...
I've loved DJ Shadow ever since I was introduced to Endtroducing... by a mate of mine. His beats are just rock solid and his feel for melody is beautiful. Lately, there have been two newer guys who've been making music somewhat similar to Shadow but obviously with their own unique flavour.

Diplo or Diplodocus made his name together with people like M.I.A and releasing a rather spectacular solo album in Florida. He's also got a live mix out with Fabriclive 24.
You can read this Pitchfork interview with the man himself.

RJD2's first album, Dead Ringer is marvellous, with Chicken-Bone Circuit really really sounding like it came off a Shadow LP and he's followed up with Since We Last Spoke.
Its been a while since I've been excited by any new music but if anything these guys might be it. They might not be quite the same level as Shadow but I'm pretty sure they're gonna get there.

