Hey snarl, you should consider gamersgate.com as well in purchasing King's Bounty. Gamersgate.com is run by Paradox Interactive (Europa Universalis, Hearts of Iron, among other titles). They've had quicker patches than both Atari and Direct2Drive for King's Bounty and 1.7 is already available.
I use it for King's Bounty and haven't had any issues. I've used both Impulse and Steam as well for other games. Gamersgate allows you to download whenever you want, and only needs to activate the game upon installation and after that there's no need to connect online to play the game.
Atari's download site apparently has some kind of 2-3 month limit on re-downloads, I've never used it, but stayed away from it because of that and from the forums they've been behind on patches.
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