Interesting challenges.

I guess it is almost impossible to crack the third one. I did some searches and math:

First wallet: About 800 4-letter names x lower/upper cases => 12k to 13k

Second wallet: About 9000 5 letter words x lower/upper cases => 250k to 300k

Third wallet: Exactly 52^6 = 19,770,609,664

The fastest cracker we have, Dirbaio, can do 20 tries/second. He will take about about 31.34 years to find! No one will commit this much energy and time to crack the wallet with only 0.1BTC, and therefore the puzzle will not be solved... unless minimalB is going to provide some hints.

Which pool is he using?

Kudos to everyone who contributed to the continuous improvement of the network!