I meant to post this a while back, but in the madness of moving house, I forgot. If you're a Windows or Linux user, chances are you use the Open Source Firefox browser from Mozilla, or maybe their excellent Thunderbird mail and news client (version 1.5 recently released, btw). You might even use them on a Mac. In any case, if you like Firefox or Thunderbird you might want to consider buying some cool gear to help advertise and support the software. I recently discovered that they have finally opened the International Mozilla Store which means that if you live in the UK or other (non-US) parts of the world, you no longer have to pay ferocious shipping charges.
I am now the proud owner of a tasty Firefox tee :)