In all of the gaming threads they have the apps iTunes page embedded in the first post.
How do they do that?
The BB code that is used is [ appinfo=all ] iTunes link [ / appinfo ]
all the spaces need to be removed, and the easy way to get the itunes link is find the app in iTunes, then right click on the large icon and "copy link" - then paste it in the appropriate place... Easy as pie...
If you want to see it - just press the quote button on any post with the code - and you can then see the actual code in the quote section of the reply.