Nice little site that lists hundreds of common language errors, including some lesser-known common mistakes. It also aims to confirm usages that the pedants are normally ‘correcting’:
Till vs ’til
Since it looks like an abbreviation for â€œuntil,â€ some people argue that this word should always be spelled â€œâ€™tilâ€ (though not all insist on the apostrophe). However, â€œtillâ€ has regularly occurred as a spelling of this word for over 800 years and itâ€™s actually older than â€œuntil.â€ It is perfectly good English.