IANAL either, but I do have some experience with circumstances such as this, and I believe it is entirely possible that the donation of web hosting services, functionally equivalent to a "product" and having a clearly established market value, are tax deductible.
I think the indication you received in your quick search may well be accurate. Several years ago a corporate client of mine engaged my web development services to work on a project for a large national 501(s)(3) corporation. The charitable organization treated those services as a "gift in kind" from the corporation and the corporation's tax professionals assured the corporate managers that, as such, the funds the corporation expended in that endeavor (my bills rendered for those specific services) were tax deductible.
Another example with which I have experience is a circumstance where a performer's fee for performing is considered such a "service" as opposed to being a donation of time (as could be the case if that same performer donated his/her "time" working for the charity in some other capacity and for which the performer is not normally compensated).
What I do know for certain, is that these things are rarely as "simple" or "clear-cut" as one might think; and that it is probably possible to find an attorney or accountant to argue either side of a contested determination .