You need to check the Goldpoints site for redemption information. (I usually access it through the Radisson website). In my own case, I don't save Goldpoints themselves, but rather, I have them automatically swept into my FF account. Here is some information from the site concerning partners and the 4:1 ratio (which is not necessarily a bad deal, by comparison to other hotel programs):

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Exclusive Radisson Airline Partner Rewards:

Only a Radisson Gold Rewards member is entitled to redeem Gold Points to airline miles at a 4:1 ratio. Redemptions are available at 2,000; 6,000; 10,000; 20,000; and 50,000 Gold Point increments. PARTICIPATING AIRLINE MILES PARTNERS: Air Canada, American, America West, Asiana, British Airways, Cathay Pacific, Continental, Delta, EL AL, Gulf Air, Icelandair, Latin Pass, Mexicana, Midwest Express, Northwest, Qualiflyer, TWA, United, US Airways.

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So that's the deal. But keep in mind that both Radisson and/or your airline may run promotions from time to time that enhance the typical point awards and if you happen to be Radisson elite, it's a nice bump, too.

Happy contrails!