Unfortunately the kindle is optimizing for users buying Amazon content, not for being the best general purpose eReader. This incentive mismatch between Amazon and the end users is probably why we will never see such a feature built in.
If you jailbreak your Kindle and install Koreader (mentioned upstream) you can have high quality PDF reflow, with support for two-column layouts as well as math and displayed equations, on your Kindle today.
Wow, that's quite the (both) useable and useful software - thank you for the link. I'm not normally part of the "x should buy this out" group, but in this case, Amazon really should.
No, they shouldn't - because if it goes against their business interest (having Amazon-bought books look better than manually uploaded content), they'll shut the project down.
The only reason this software is any good is specifically because it isn't controlled by Amazon. This functionality is very deliberately missing from the stock Kindle.
