Most of my twitchiness is just selfish though; I'm worried that I'll be labelled a sluggish payer just because I'm reluctant to send a blank cheque through the post. And if I send any more email I'm worried I'll get negative feedback for being impatient, hassling, etc.. ... I also want my pretty dress, dammit!
The seller does give a mobile phone number in their details, but I think that should be a last resort; it feels a lot more intrusive to contact somebody on their phone (even by SMS, which is all I'd do) than it does to email them.
Gah. Getting physical Stuff from A to B really is the major weakness in the e-utopia. I want to pay online and have my Stuff beamed to me in some kind of whizzy matter-transporter thingy. And I'd like a flying car so I can go and pick up my own personal moon-on-a-stick, too, please.