So for those of you that don't know, Skype isn't just PC->PC, it's full-on VoIP with landline and cell access too, if you buy Skype credit. Apparently it's pretty cheap to call phones from the PC program (2.3 cents a minute pay-as-you-go anywhere, or $3 a month to "unlimited US and Canada"), and with a different subscription you can even get a number with skype that people can call from their phones. This free offer though, appears to just be PC->Phone calls, to further convince users to switch. You sign into your Microsoft account with your MSN details, then visit the link they sent you in your e-mail if you got one (which, humorously, has "skypewithlove" in the URL) and somehow redeem the free month of credit (when signing up for a recurring payment like normal). I assume this is only for your merged Skype+MSN account, I don't know if they let you redeem it on an existing Skype account.