Sorry if this is a bit late...
Bridesmaids - normally a necklace or piece of jewellery, but make sure they know it is simply a gift and that they don't have to wear it for the big day
Bestman/Ushers - cufflinks, or maybe for the Bestman a silver hip flask
Parents - We didn't give the dads anything (ooh, now I feel bad!) but just after the speeches we each gave our new mum a huge bouquet of flowers to say thanks for everything.
Remember as 4getmenot says, it's your day, so it doesn't have to be expensive gifts, just a wee keepsake to say thanks!
Good luck for your big day.