 Re: marketing tips
Most business people are sane. You could walk in with a shirt that says "Your name could be here" "Your logo could be here", but that's not as impressive as a shirt that you've already put forth the effort to design specifically for them. It shows that you've at least done research on them and have put some time into a product for their use. I haven't ever had someone go off the deep end doing this, and it has gotten me orders.
If you're absolutely dreaded you might be facing someone insane, when you call up to schedule a time to meet, tell them you would like to show them a sample of your product, which includes their company logo/etc in hopes that they like it and will permit you to use it to reproduce for their use only, or something along those lines.
I personally like the "here's what we can do" and then reveal "their product" to them. I've not yet faced one person claiming I had no authority to do that, and I was going to be charged, etc, and I've dealt with small businesses as well as some casinos in town (the casinos I'm sure would've been the first to pipe up if anything). | 
