As well as being against stackoverflow rules these 'best tool' question are a real pain.
They are rarely current and often have answers (such as my own) that can't possibly be objective.
Because I'm a tool developer, in the past I've felt compelled either to answer such questions or correct/update existing answers that reference my products. This was a mistake - I should have been flagging these questions for closure (but that itself would have had a COI element to it).
Such stackoverflow questions now often rank higher on search engines than the products their answers reference, this is just wrong.
I've noticed some of these questions are now being closed, but closing is not enough because they will be showing dated and misleading information in search engine results.
I'm all for products being mentioned in answers, so long as it's within the context of a good question.
There's 'Conflict of interest' all over this question of course. It's kind of damned if you do... If such questions were removed then my main product would most likely be reached directly from a search result listing, whereas right now its reached via a stackoverflow question (because it's actually referenced in the first line of the question).
[Update - one year on]
Noticed today that more traffic on my website is coming direct from Google rather than via a Stackoverflow 'best tool' question - the question has been deleted, good job...hoping that further deletions of 'best tool' questions will follow - perhaps before next year.