I think te Pearl is small enough that you can carry two products.

I already carry two products, a mobile phone (SonyEricsson P800) and a PocketPC. The P800 do play MP3, but actually the max memory it 64mb (it's a lot for a phone, but not enough for a MP3 player). I use my PocketPC also for playing MP3, but it didn't have enough storage memory for me (4 albums in 256mb) and the battery last only a day while I'm using it like a player . I don't use moving part memory (Microdrive or Toshiba drive like the iPod) to avoid even shorter battery life.
I was thinking to buy a new product : the Pearl, so I don't want a fourth one to carry around.
Some mobile do have radio inside (Nokia, Samsung, Siemens) but not the P800 .

What CURRENT product do people use that has both a tuner and radio receiver?

What do you mean by this? A tuner could also be used to receive VHF TV signal and a radio could also be used like a receiver/transmitter (like a CB or a walkie-talkie). For me when I say "radio" I mean a radio to receive FM/AM station.