Will PC giants move into mobile phone markets?

From what I have known so far, HP has already come out with their own brand PDA phone and Apple will soon come out their advanced mobile phone with MAC OS. So I'm wondering, will other PC giants follow their footsteps by coming out their own brand of mobile phone? It's undeniable that mobile phone is a compulsory items for people nowadays, some of us even own more than 1 mobile phone due to different needs. To consumer, having more choices of mobile phone will definitely benefit us, but to existing mobile phone provider, the coming in of PC giants into the mobile phone market might be a stiff competition... Anyway we shall just wait and see... (I'm a Nokia supporter btw, hehe)