Why are there 2 different pages for this show on IMDB?

Because Da Ali G Show (2000) is the UK version and Da Ali G Show (2003) is the US version.

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Because the original UK show (one season, 2000) was called "Da Ali G Show" - and the later US show (two seasons, 2003-2004) was also called "Da Ali G Show"

For the UK, presumably to reduce confusion, they renamed the US show "Ali G in the USAiii" - but the original UK show wasn't released in the US (IIRC) so you guys are stuck with the two-shows-same-name confusion - sorry about that.

Here's the breakdown:
* The Ali G character first appeared in an obscure UK "youth" show called "F2F" (1996-7) - these were very early outings for the character and the look and patter aren't really nailed yet.

* The character took off big-time in interview segments on a late-night UK comedy show called "The 11 O'Clock Show" (1998-2000) - a show which also introduced Ricky Gervais and Charlie Brooker. The original "11 O'Clock Show" interviews (and some "F2F" material) were released on a DVD compilation called "Ali G, innit"

* The character then got his own UK show, called "Da Ali G Show" (2000), which adopted the classic chat-show format with guests coming on to be interviewed, music breaks, etc. I don't think that show was ever released on DVD in its entirety (?) but there were DVDs called "Ali G, Aiii" and "Bling Bling" - which were "best of" compilations of clips from that show.

* Next came "Ali G Indahouse" (2002) - the theatrically-released movie.

* Then came 2 seasons of the US series on HBO (2003-4), which was also called "Da Ali G Show" - renamed "Ali G in the USAiii" for UK viewers.

After that, Sacha Baron Cohen moved on to new characters, like Borat and Bruno, saying that the Ali G character had to be retired because he was now too well-known to be able to interview people who were unaware it was a comedy act.

That's the Ali G story as I understand it. Hope that clarifies things for everyone!