Some of you are grabbing the wrong end of the stick and beating around the bush with it. Nowhere in the OT does Han claim to have never heard of the Jedi--you're making a straw man out of that nonsense. His exact quote is:
To use a real-world analogy, I'm sure we've all heard of feats of physical and mental discipline that Buddhist monks are capable of....Does this mean that we must believe in Buddhism?"Kid, I’ve flown from one end of this galaxy to the other; I’ve seen a lot of strange stuff, but I’ve never seen anything to make me believe there’s one all-powerful force controlling everything. There’s no mystical energy field controlling my destiny. It’s all a lot of simple tricks and nonsense."
The difference is that buddhism isnt controlled by midichlorians...
The thing is, maybe there is no news service or whatever, and maybe Han just didnt move in the right circles. However, when you get right down to it, what Han says about the Jedi gives a totally different impression than one which is right at the centre of warfare and politics, with some kind of documented scientific evidence for its existence. Yeah, maybe the jedi kept that a secret... whatever. And maybe lightsaber fights were all fast in the PT because 'oh, well, this was the jedi at the height of their power'. Snore.
You can jury rig any explanation you want about where all the battle droids went, why lightsaber fights were different then, or why Han didnt believe in the force. Ive said it before, and Ill say it again: the OT and PT are completely different, except for a few words which occur in both trilogies.