For those a bit lazy :) , here is a guess from the members list

0 posts - Canonflex

4 posts - PowerShot SX30 IS

50 posts - PowerShot G12

100 posts - Rebel T3i

250 posts - 5D Mark II

500 posts - 1D Mark IV neuroanatomist might verify this as I am not sure

???? posts - 1Ds Mark III neuroanatomist has 1125 posts, and still 1D Mark IV

0 posts - Canonflex

4 posts - PowerShot SX30 IS

50 posts - PowerShot G12

100 posts - Rebel T3i

250 posts - 5D Mark II

500 posts - 1D Mark IV neuroanatomist might verify this as I am not sure

???? posts - 1Ds Mark III neuroanatomist has 1125 posts, and still 1D Mark IV