If I was getting married now I'd use the White Stripes' song that was used in the TV ads for Six Music... though the irony might be lost on any guests who aren't Answerbank regulars ;)
Otherwise, my favourite love song that doesn't include too many ironic/ inapropriate lyrics would be God Only Knows by the Beach Boys.
We didn't have one as they always seem very tacky/un-original. If i was to marry again (same wife obviously!) then i'd learn to waltz and ask for "Ave Maria"
Jennifer Rush - The Power of Love. THE Bryan Adams song. Brook Benton - So Many Ways. 2 from Etta James - At Last - and if you feel brave - I Just Want To Make Love To You. There are just so many to choose from. Darth, renew your vows then you can have Ave maria - beautiful song, by the way!