Tom ..I applaud your sentiments ... there are one or two practical problem which might make it somewhat difficult to implement your idea.
Firstly, the majority of questions asked on these forums have been asked before. The problem is that many forum visitors fail to use the search feature, fail to read the stickies, fail to read the User guide, fail to realize that Google is their friend, and in short bypass all these useful items in favour of asking a question on the forums which some kind soul will answer ..either by repeating something for the hundredth time, or posting a pile of links to replies given elsewhere
Each forum member who might help will have a different idea of what they consider the best tool for the job. Further ... A mac section and a Windows section would be required .... and so on
Most importantly, in this computer world where new applicatations and methods are being introduced daily, any such list would be out of date before it was compiled, and updating it and weeding out the dead links etc would be a mamoth job if the list was to be of any use.
Also we do have the Tips and Tricks forum, which might have been designed rather for this purpose ... but rarely is.
Certainly you have given food for thought