root canals, tax audits, or head lice, we think you did the right thing. If you hadn't capitulated, you would have received a series of abusive letters from lawyers, each escalating in tone, followed by a mandatory domain name arbitration or a civil lawsuit. Regardless of whether you would prevail in either of these battles (and if we were a betting blog, we'd bet on Time-Life), we doubt you'd want to deal with the hassle.
How come the previous post said ... Our previous entry on "Fortune 500" explained that informational uses, for example -- using the Fortune 500 trademark or logo in a book or magazine (or in a blog) -- do not require permission. However, commercial uses such as creating an online information service, will likely run into problems. We know the difference between informational and commercial uses is slippery, but one dividing line you can use is to ask whether the mark is being used to analyze or discuss the associated goods or services (for example to reflect on or discuss the "Fortune 500" phenomenon). In that case, it is more likely informational. Finally, the use of "Fortune 500" as part of the domain name is going to set out a separate series of flags as it may be viewed as a form of cybersquatting.