janPiteJansekeJohn Clifford
Natural languages, if they are weird enough, e.g., Basque, said to be the hardest to learn.
Looking at suggested languages, aUI has little internet support but a real book, toki pona has a good community going and some Internet support and an interesting creator, if you can catch het. And don’t forget Loglan and Lojban. Dothraki also seems to be building well.
Literary conlangs outside of a few big cases (Tolkien, Caves, Elgin) are a poor lot, merely uggamumble with lots of qs and odd clusters. Even Lewis, who could do better, is very skimpy — mainly names, as is usually the case.
November 8th, 2011
http://conlangery.com/2011/11/08/we-need-help-again-another-poll-and-some-more/