What are the different frame styles or 'generations'?
The Glock frame has evolved through 3 styles known as generations. There are quite a few sub-generations, limited runs and experimental frames but these are the major breakdowns:

1st generation
smooth grip
no finger grooves
no rails

2nd generation
textured grip
no finger grooves
no rails

3rd generation
textured grip
finger grooves
accessory rails*

*accessory rails are not available on the subcompact Glocks


Here's an EXCELLENT picture contributed by Butch Barton that shows all three frames together:

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