Merchandise - Mugs ,Polo shirts,Harrington style jacket, v neck Jumpers,Peaked cap,Sew on patches,Pin badges ,to add to whats already in the shop.
As far as like t-shirts go keep the osf logo on,put a print of an osf car (large) or say four cars(small)on front with osf address underneath,do t-shirts in different colours.
All the things above embroider design on,(apart from mug obviously)
Their was a comment somewhere about things been a bit plain ,then just add an osf car picture.
How about having small logo's (embroiderd on if you like on sleeves a bit like dart players have)of dealers that sponsor on the site.
If at the start of the year there is a list of shows,meets etc already organised,why not put them on the back of t-shirts (like tour dates on back of band t-shirts.
What about osf address decal to go on outside of car,doesn't have to be very big.
OSF wheel / hub centre caps, steering or wheels.
Personally whatever type of merchandise i would alway's have the osf address on it ,a potential new member will then see it as an offical site,if it just say's osf ,people don't have a clue what in means unless their in the know.
As far as the site itself goes i don't see whats wrong with it, apart from the shop needs sorting,bit of a minefield to find stuff and order it.Been trying to get a couple of stickers but given up now ,lol
Hope all above is of some help,if not just talk over me. !!