Hi folks!
What about a new version?
V6 - https://dl.dropboxusercontent.com/u/1189851/jhPrimeminer-GMP-v6.zip
32bit: https://dl.dropboxusercontent.com/u/1189851/jhPrimeminer-GMP-v6-32bit.zip
Changes:
1. Initial Auto tuning related to L1 cache size. It takes about 4 min after the minder was started. For some configurations can double the seeped.
2. Keyboard shortcuts for those that likes to play with the numbers.
3. Round sieve percentage - Similar feature that was introduced in mikaelh's hp8 primecoin client. https://bitcointalk.org/index.php?topic=255782.0
Basically the parameter sets how much time is spent in the sieve and how much time is spent on checking the candidates produced by the sieve.

Enjoy.

Edit: Both the miner and the mpir.dll Compiled with AVX flag - https://dl.dropboxusercontent.com/u/1189851/jhPrimeminer-GMP-v6-AVX.zip
Edit2: The jhPrimeminer-GMP-v6-AVX.zip now contains the vcredist_x64.exe which is required to run the miner. It can be downloaded also from MS: http://download.microsoft.com/download/1/6/B/16B06F60-3B20-4FF2-B699-5E9B7962F9AE/VSU3/vcredist_x64.exe

Edit3: The AVX version is the same miner compiled to support the AVX instruction set from the newer CPUs. You can check if your CPU support AVX using CPUZ. http://www.cpuid.com/softwares/cpu-z.html. From my initial testing I couldn't find any significant speed difference between AVX and the regular one, probably because the code wasn't written to use it. If somebody can come out with a proof that it's worth using AVX then let us know.