The code that gives you the Tiny mount is available for 50 uses; after that it is gone.
Yes, you can have as many mounts that you can buy, have drop, or are given. There is absolutely no limit on the amount of mounts that you can have.
There are roughly 9-10 million active subscriptions for World of Warcraft.
Currently in Mists of Pandaria, the latest expansion to World of Warcraft, there are 90 levels.
No, you can not play World of Warcraft without a subscription unless you play on illegal private servers that are not supported by blizzard. These servers can be much more buggy and you will be kicked off the server many times because the server itself crashes many times and generally by an all around mess. EDIT: you can now play World of Warcraft for free until level 20.
Assuming every single subscriber in World Of Warcraft plays which is ten million subscribers, then it is assumed that there are ten million people playing world of Warcraft.
too many...
It is estimated that around 9500 people join World of Warcraft every day.
These mountains are not the most climbed in the world. There are many mountains, big and small that are climbed a lot more times.
There are many forums available on the official World of Warcraft website. WoW also has many "fansites" that can be found on the official website: http://www.worldofwarcraft.com Here is another website: http://www.fanaticsofwow.webs.com
In the past couple of years, there has been about 800,000 subscriptions canceled. This leaves World of Warcraft with about 10.2 million subscribers.
World of Warcraft had approximatly 9.3 million subscribers by the end of 2007. In January (2007) they had about 8 million.
Around 5,000 people from all over the world have reached the summit of Mount Everest to date.