For several reasons I will no longer be making suggestions by brand names. It is just not fair to anyone involved (Companies or Users) and tends to lead to improper conclusions by others based on my opinions, which was never my intentions.
Those suggestions you mention were more for P35 then anything, and generally to users who seemed to be having issues with other sets. Mainly in P35 boards a few models from a few brands seemed to have various issues with P35 (Not sure why, or which exact models from various brands though).
That is why there is QVL lists, some memory just does not work properly for some boards, sometimes. Memory manufactures and motherboard manufacturers try their best to test things together, but with the 100's of products they both make often times everything cannot always be tested together for compatibility. There will be times when something from any brand may not work with another brand simply due to physical issues, manufacturing processes, or for various known/unknown reasons. Companies on both sides of this fence do their best to solve these issues but a resolution is not always as simple as it may sound.
Crucial's new 2.0V kits prove to be fine in my tests for P35 and P45. I do know though some of the older Crucial 2.2V sticks did have issues sometimes with P35 boards. Again, I am not sure why as I have only tested the new sticks recently. I have not done any testing with the older kits, aside from a set of LanFest sticks and one set of 2x1GB 2.2V sticks I did a year or two ago with P35.
Yes, I have thought about testing some G.Skill but just have not had a chance to contact them as of yet.
Hmmm, about your 4x1GB vs 4x2GBGB question....
I only tested 4x1GB as it seemed to be giving a lot of users issues, so I thought 4x1GB would be best to see if Crucial could help me test so that I could help those users with issues.
I did not ask for 8GB for testing as I think that would be asking a bit much as this was my first time even speaking with them. I do not see any potential problems with 8GB. I think P35 and P45 can both easily run 4x2GB with the proper settings of course.