During the Burning Crusade characters have to choose between various factions, each of which has their own rewards such as unique recipes, etc. Aldor and Scryer are the most important factions and I've started to compile information about them as well as any other faction info I can find. The most linked-to comparison between rewards you get from Aldor versus Scryer is the one on WOWwiki.
WOW Insider wrote two articles about choosing between Aldor and Scryer. Here they are below. Note that the second link is mostly comments asking folks what they choose and why.
Ten Ton Hammer has a great comparison.
Here is a list of all the faction recipes. Not searchable but organized by type of recipe (leatherworking, enchanting, engineering, etc.).
Another gear list.
Here is a shorter comparison.
A guide.
A detailed Alliance guide in several parts. Sorry, they didn't do a Horde guide.
Aldor and Scryer are not the only factions in the Burning Crusade. Here is a list of factions and rewards compiled from various sources before the Burning Crusade came out.
Another list that describes the factions in general. WARNING: The Solo MMO Player doesn't think all this information is correct.
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