Clarke (Michael :P ) , perhaps not as good as some of us Aussies would have you beleive but he's a serious talent & should crack the test team by 2005.
Ian Bell is very talented , had a superb 2001 but has done little since in FC cricket (although his OD form has been good , I was suprised he wasnt in the ODI squads for Bangladesh & Sri Lanka).
Patel has a huge future in the game , Marlon Samuels has more talent in his little finger than most do in their entire bodies , if he improved his attitude a bit & stopped getting out to lazy shots I reckon he could make a very good batsman.
2 young Bangladeshis I was very impressed with , Mushrafe Bin Mortaza & Hannan Sarker , Mushrafe is pretty accurate & can get it in the 140's when he wants to , Hannan is a compact opener & his shot selection has looked excellent to me so far.
Tatenda Taibu & Travis Friend also got lots of ability , a few other young Australian's to look out for with in next 5 years would be Shaun Marsh , Mark Cosgrove , Mitchell Johnson , Xavier Doherty , Marcus North , Luke Ronchi & Cam White , Shane Watson & Shaun Tait , who have all represented Australia A or Australia.