We're working on custom swag for the photo.SE community. Based on this chat session and this one we are thinking of making Photo Stack Exchange branded camera straps and 18% gray lens cloths. What do you guys think? Would these be cool and useful for you? Do you have any even more awesome ideas for merch? Leave your feedback below!
Of course, there's the idea of business cards, perhaps featuring their photos on the reverse, with details on t' front - might be more useful for the semi-pros, rather than the pros on here, but I'll through that idea into this mix :)
I think camera straps will be nice, specially if they're nicely padded. I also like the idea of HQ waterproof/weatherproof stickers. Also an online badge showing reputation, rank etc can be handy for people having their own website.