I'd think when the authors of PSX believe that the emulator has been updated significantly enough to warrant calling it 2.0, many other emulators, such as MAME use incriments, MAME isn't ever going to even hit 1.00, it's on .114u2?
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-Dreams of getting a new 360 XBOX in 201x.
-Current consoles: Playstation 2 and Wii, also has DS/GBA and a PSP 3000
-PC: AMD 5000 2.6 Dual Core, 2GB Ram, 8600 GeForce GT video card, SB Live!, Win XP SP3