There is a new acrostic crossword puzzle every two months which appears in the Alberta Views magazine. Solve it to reveal a quote by an Alberta author.
This site contains a 1000 free pages of puzzles, including wordsearches, acrostics, and crosswords. They offer quick fix puzzles to unregistered visitors, and many more to members (free).
Sue Gleasonís Double Crostic Puzzle Page
This site has traditional quote-based acrostic puzzles, playable in online contests. Daily for subscribers, several for guests. There are also vocabulary and trivia acrostics.