I know that in the next couple of months hybrid drives (hdd with flash memory) will start to hit the market.
My question is will they be worth the wait when they arrive?
The reason is i want to build a new pc but it could easily wait a few months.
You dont have to wait, you can get something that will achieve the same effect. The thing about HHDs is that they are a cache desinged for windows Vista. Vista is desinged to take advantage of any flash memory, which means that there are other ways of geting performance from flash cashe. There are in fact 4 (!) ways to use it, a hybrid hard drive, a USB flash drive, Intel's robson and seperate internal flash drives. The thing with hybrid drives is that the cashe is tied down to the HD and vise versa, with robson its the motherboard (maybe, it may be socketed). The USB flash drives are the most versitial and cheapest, as you can use them as accual data storage rather than cashe if you wanted (however its limited by the USB port speed which may or may not be an issuse).
I myself will be geting an internal 4GB sony flash drive, as it can simply be put in when Vista comes around and i dont have to worry about it (that and i can Upgrade by adding another or replacing it). So anyway IMO they will be worth it for several reasons, lower power consumption overall, Much faster boot ups and faster general desktop performance. But those may not be what you would consider worth waiting for, you can figure it out later anyway, because it wont matter until Vista comes out. Hope I helped.