From one netbook gamer to another, here's a piece of advice that should hold true for all the games you intend to run on your netbook:
Try the
demo first.
Being able to run the demo does not eliminate any and all issues with the GOG version of the game of course (I have been burned - GOG, answer your damn support tickets!), but it does give a pretty good indication of whether or not you can run the game at least.
A couple of other good resources for your netbook gaming needs are
and [url=http://netbookgamer.com]netbookgamer.com , both of which have databases of which games have been tested on netbooks.
You should keep in mind of course that a netbook is not just a netbook anymore. While a majority of them tend to stay within a short range of certain specs, there are netbooks with specs that are significantly lower or higher. I might be able to give you a clearer answer if I know what machine your trying to run the game on.