All PS3 games use Blu-Ray, even if the content is small they will use padding to bulk the discs up slightly. As for LCS and VCS not requiring that much work, They needed to create a whole new engine for the PSP to use which later turned out to be a heavily modified version of RAGE. HD-DVD Vs. Blu-Ray, who cares unless you plan to watch films on the things, but going on Sales, Blu-Ray is winning against HD-DVD but still nowhere near to DVD sales (obviously). Sony have had a lot of bad formats and a lot of good formats, luckily for them, Blu-Ray is turning out to be one of those good ones.
PS: Not a fanboy