Some of the less useful presents for ds were:
clothes inappropriate for the time of year (eg - snowsuit that would only fit in the summer )
toiletries
endless cuddly toys
pram shoes
Great presents were:
handmade/knitted things
blankets
bibs (I could never have enough)
books which have been read as he got older
If any of your friends are going to try reusable nappies, how about buying a nice wrap?
I got loads of flowers, which was lovely, but didn't have enough vases for them all. I think offering practical help can be a great gift, eg - taking round a meal.
My best present was probably the book "What Mothers Do." And I wish someone had made me read a Deborah Jackson book while I was pregnant or during my first weeks with ds. So perhaps a book you have found inspiraional would be a good present?