I know that we are all at a point where we are worrying about who to tip and how much and thus posts are getting repetitive. Sometime near the beginning of my 1 1/2 year engagement someone posted this link and I bookmarked it knowing it would probably be helpful in the future. Of course this is just a guideline, but it might help some of you out.
http://wedding.theknot.com/wedding-planning/wedding-budget/articles/wedding-vendor-tipping-cheat-sheet.aspxHope this helps!