Like JB said Vista is the big thing in the pc world, along with the new Windows feature called Sideshow. This component seems to be catching on with companies who heavily rely on Microsoft, or companies that don't make a move without them. Companies like Dell and HP have yet to showcase laptop models with this feature which is interesting, it will be cool to see if this feature catches on. TWo more big news topping adancements both of which are not featured in most laptops, and if they are they are not availabe in laptops that are built for the thin and light or ultra portable market. They are Blu-Ray and HD DVD drives, these two are still locked in a battle for the next gen DVD format. Dell has sided with Blu-Ray with Apple and HP is HD-DVD with Microsoft. A product like this is far off, but then again with technology progressing we could see more of these drives as early as July, doubtful but possible.
The last feature taht will turn heads is hybrid Hard drives. They are drives that intergrate flash memory as a buffer before the data is written onto the actual hard disk. This will increase battery life and in some cases quiet the system down.
All in all you are going to see things come out. Thats the challenge, however I do suggest you do wait until the release of Windows Vista, and if you are set on the Apple you can go for a Macbook, but be mindful that Leopard will be coming out followign Vista. Of course you can always upgrade, I don't know specific details on Apple upgrades. Bottom line wait for Vista and then go for it.