I hate mailing lists. At low level of traffic they can be okay, but you still have to visit a website if you want to search the past questions. At high level of traffic the signal to noise ratio far outweighs any use you might gain from the large number of users. Sifting through the results can be traumatic – Thunderbird is okay, but GMail is not mailing list friendly. A forum is a lot better method of getting answers and results in my opinion.