My mom, sister and I are seeking a driving holiday in Ireland... we'd
like to rent a car and stay a bed/breakfasts... Is there an
organization that sets up this kind of a trip for us?  We'd like to go
in August and we know that's peak holiday season.

tks mks

Great idea.  There are many websites for B&B in Ireland.  Here, just a couple:
http://www.family-homes.ie/
http://www.ireland-bnb.com/
http://www.travelireland.org/accommodation/bed-and-breakfasts.html

The last one also has clicks for car rental and for day tours which
leads you to a site with escorted bus tours, which may give you ideas
for planning your own tour.

Good luck!

In addition to myoarin's web site you may wish to contact The Irish
Tourist board at

http://www.failteireland.ie/fi

They use to be called Bord Failte. Now they call themselves Failte Ireland.

This organisation use to do  a great job in planning and booking Bread
and Breakfasts at short notice. However this may have changed in the
Internet
age. No harm to give them a call to see what they do offer.

Regards

Mongolia