It might help if you could narrow down a bit the sort of information you're after.
For starters and general reading on the subject, try these:
Aviation Pioneers - An Anthology - extensive info on most of the influential early aviators, their machines and companies.
The Pioneer Aviation Group - there are links on this page to several sites dealing with (mostly American) pioneer-related topics.
European Aviation History 1900 - 1914 - including a fantastic article on the 1911 Round Britain Race, plus more.
There are plenty of sites dedicated to particular individuals and events. Let us know what you're looking for and we can probably point you in the right direction.
Eric