So let's see if I can remember this correctly, from the original go-round with Galoob:
Series 1 (1996):
Sandcrawler (I remember this one peg warming somethin' fierce!)
Series 2 (1997):
I think that was it, from what I recall....
Then, a couple years later, there were like 8 more Episode 1 die-cast vehicles made as well.
Definitely plenty more OT ships/vehicles that I'd love to see them do now as they hopefully continue on with this line beyond what they've already got molds for (like Vader's TIE, AT-AT, B-wing, TIE Interceptor, Bespin Cloud Car, Imperial Shuttle, etc). If they just rehash the exact same ones, with nothing new, that'll suck, and suck hard. But at least these should have some slightly upgraded paint apps I think...