I quite often get asked for advice on invitation wording.
We do have a small section for wedding invitation wording on the Alannah Rose site here that caters for most wedding scenarios.
Another site that I love and is great for wording is www.verseit.com
This little gem has wording for all occasions, weddings, engagements, christenings and baby showers, together with verses and poems if this is something you are also looking to add to your stationery.
Always remember to choose a style of wording that is relevant to the style of day you are planning. If it is a formal occasion, then something very formal is appropriate and vice versa.