[batista]

>What exactly is Intel trying to achieve with these integrated GPUs?

A better performance/energy consumption ratio for lightweight laptops?

>It seems that performance-wise they're quite far below discrete graphics cards, so I'd guess that they're not really meant for gaming.

No they are not. But then again, very few GPUs are actually used for gaming. Most people over 25 use their computers for others tasks (including all enterprise and work computers).

>Are they intended for everyday computing purposes that might require graphics acceleration, such as high end display managers?

Most computer use today requires graphics acceleration. From browsing the web (canvas), to watching an HD movie, to talking on Skype/Facetime.