The solitary analog nub on the PlayStation Portable has been a much criticized feature.  When rumors first surfaced about the PSP Go, many fans of the multipurpose handheld felt the addition of an analog nub was a foregone conclusion.

During Sony’s E3 Press Conference, Kaz Hirai, President of Sony Computer Entertainment noted that the PSP Go was a result of feedback from developers and gamers alike.  With so many fans clamoring for an additional analog nub, how could the feature be omitted?

According to Shuhei Yoshida, President of Sony Worldwide Studios, it was considered.  In the latest issue of Game Informer Yoshida explains exactly why it was left out:

“We also felt - like many users - that we wish we had a second analog on the PSP.  But we are talking about the mid-life cycle of this platform, and the PSPgo is designed to be perfectly compatible with the PSP-3000 and all the games that released before that.  So we had a very serious discussion about this particular subject, but we decided not to add a second analog, and some of the developers are doing quite a nice job translating the second analog functionality to different buttons.  We didn’t want to divert their efforts either.”
- Shuhei Yoshida, President of Sony Worldwide Studios

For developer’s sake, you can’t create two different control form factors in the middle of a handheld’s life cycle.

http://playstationlifestyle.net/2009/07/21/sony-considered-an-additional-analog-nub-for-psp-go/

I guess it should be obvious that the PSP2 will have two anolog nubs, thats good.

I don't have a PSP, but it seems like it makes more sense to have at least the one nub on the right side than the left (For shooting and moving).

Why are people so obssesed with dual analogs for PSP when first one is pure junk.

Personally I could live perfectly without this abomination.

Well of course, only idiots expected the Go to have two analogue sticks

Why would a second analog stick make the PSPGO incompatible with PSP games? The Sega 6-button controller didn't remove any compability, but it made controls much better for the games that supported it.

Because then you have Go games and 3000 games, it makes it a PSP 1.5

"and the PSPgo is designed to be perfectly compatible with the PSP-3000 and all the games that released before that."
*cough*no UMD*cough*

What about the PlayStation? That had ZERO analog sticks to begin with, and then got two.

I see their point, though, which is that there IS no point in adding another analog stick. It wouldn't be compatible with the majority of PSP games. Might as well wait for the PSP2 or whatever they call it (PS2P? or maybe PS3P since the PSP is basically PS2-level power)

I think its good that they didnt add the second nub. They made a good point regardless of all the people that beg for one.

They will allow you to transfer your UMDs to the Go, they just haven't announced how yet