here is an improved feature list
, with links detailing the more technical features.
if you have any more questions, this is a good place to ask!
windows 7 will be out on general release on october 22nd.
i don't know where you live, but some online retailers have windows 7 available on pre-order for a nicely reduced price, so you can buy it now for a good price, but it won't be delivered until october 22nd.