@greenbeans

Alliance has:
40 Faction Mounts (including flyers)
8 Talbuk mounts from Kurenai (takes about 8 hours of grinding after you do all quests)
4 mounts in Dalaran (one costs JP as opposed to gold)
1 Winterspring mount (about 20 days of work to obtain)
14 Argent Tourney mounts (9 are 100+ badges, pretty sure you can only get about 25 a day, so you're looking at months of work here)
6 Netherdrakes from Netherwing Faction (takes about 6 hours to get to exalted)
5 nether rays from Shat'ari Skyguard (another 6 hour grind)
1 Cenarion War hippogryph (this grind sucks, takes about a week due to heroic lockouts)
2 mammoths from sons of hodir (another lengthy grind)
1 red drake from Wyrmrest (mild grind if you grab a tabard)
2 camels from Ramkahen (all too easy)
9 PvP mounts
2 talbuks from Haala (requires the opposite faction to grant honor when you kill them)
2 Archaeology mounts (good luck)
3 Tailoring mounts (requires being a tailor)
3 Engineering mounts (2 require you to be an engineer)
1 Alchemy Mount (purchasable on AH for 50k+)
1 Seahorse from quests in vash'jir
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105 mounts with significant faction grinding, daily questing, and PvPing, not to mention having to be a tailor and Engineer. Paladins get 3 more mounts, Warlocks get 2 more. Without Engineering and tailoring (and not dropping crazy sums of gold for 3 of the mounts) you're looking at 97 mounts +1 for the 50 mount achievement, so 98 total. This means that Alliance needs 2 achievement, Blizz-store, or rare drops (this includes Green proto and Polar bear mounts) to hit 100 mounts. Horde has those 2 mounts with the same effort. This is why Alliance players were/are upset about not getting faction mounts for the Worgen at release. Currently the Alliance has no reason to get exalted with Gilneas other than the rep achievs and the Ambassador title.