The CCNA exam is much harder than the older one so am told. I recently passed CCNA set it as a news years resolution!Book wise I would recoomend the Sybex book and the cisco press book. The sybex book is very easy to understand and geared to you passing the exam and has some good labs to practice. But on some areas it doesn't go into enough detail and thats where it is useful to have a second source of info. With regards to the exam you will need to have:
1)Good knowledge of subnetting and VLSM
2)Switching :Vlans,STP,VTP etc
2)Know stuff like RIP,OSPF(single area),EIGRP
3)Nat
4)Access-lists
5)Frame-Relay and other WAN stuff like PPP eyc
6)ISDN-Know the reference points and look at dialer profiles
Questions are a mixture of drag and drop, simulation, problem solving, looking at outputs and theory ones.
Pass mark is 849
Good luck hope that helps.