What we have here is the proponents of equipment in the sig/tag line as being to let potential and other photographers know what gear they used, rather than my and others contention that it's pretentious wankery and posing.
For the proponents; Explain to me how a typical sig/tag of say the following is helpful to a brand new user who knows nothing about photography.
Canon D30 / waiting for 1DS
28-70 f2.8 USM L
70-200 f2.8 USM L
550 EX Speedlite
Manfrotto 160 WOB
Now to a newbie they aren't going to have a clue about lens focal lengths, or what a polarizer does or a skylight, let alone what the hell a 160 WOB is or a 70-200 USM L. So it's that much garbage to them .. and in case your wondering just look at the number of posts over the last year asking the most basic questions like what's a polarizer and how do I use it? Which lens is better etc.
Secondly since the sig/tag doesn't state implicitly what gear was used to take the photo on display, all that's being done is simply passing out extraneous and irrelevant information that is not required as well as chewing up bandwidth.
Finally .. be honest .. it's wankery guys and stop trying to justify it as anything else