> even though they know he openned himself up to criticism with
> the answer
I never really considered that, exactly. I have at various points thanked sponsors in my articles from conferences, typically in some kind of wrap-up article. But, I am sure I have forgotten more than a few times as well.
I have no problem "disclosing" that kind of information at all. But I am surprised that some think it is really all that significant in terms of determining biases. We all have biases, and most of what goes into those biases cannot be quantified by things like 'were sponsored to go to XYZ conference by ABC org'. There are plenty of other, less visible things that *could* be contributing to my biases (corporate subscriptions and advertising are two obvious possibilities).
In order to create a bias filter for a site or a writer, I think you have to read the material and compare it to what else you know of the subject of the article and go from there. Over some period of time, you will get a feel for where the biases are, and whether you trust the site/writer to, generally, accurately report things. I can certainly disclose that someone paid for some of the expenses to get me to a place where I could cover an event, but for all you know they (or a competitor) were handing me $100 bills hourly.
It just seems obvious to me that the only way to really figure out what the biases of a given writer/publication are is by reading it and forming your own opinions. Finding out about sponsorships might seem like it helps, and maybe it does, but it's really no substitute for reading and thinking about what's written.