It's legit,
You'll have to fill out a questionaire every year to keep getting it. There is some good info in it although it is geared towards enterprise stuff, so might not be applicable to your situation.

Bob

>Hi everybody,
>
>I've received a letter by mail that I can receive 50 issues of InformationWeek absolutely free.
>
>I'm wondering, if it's worth to claim, and what can I expect if I do it.
>
>I haven't checked the site yet.
>
>Thanks in advance.