Although i left Wikipedia some time ago it contiuosly comes up in Google searches. Recently, i saw an article listing myths within which was listed the Tongue Map. Wikipedia has an entry which is refuted in the Talk section. I eventually got to Common Misconceptions (and its own interesting Talk section) which can be an amusing read.
Wikipedia being inaccurate is old news, obvious to anyone who knows a subject. But if you do not know the subject and accuracy matters, be sure to read the Talk section.
A completely unrelated side note: While writing this i glanced at the clock which said "1:01:01" and did a double-take.
A side note related only in that it is unrelated: Started Book 3, Chapter 9 in LoTR