Over priced shipping is a HUGE pet peeve of mine. When you see $8 for shipping something that would fit in an envelope, you can be pretty sure they're shipping UPS - which is a rip-off for little items, its not their (UPS's) business.
Or the idiots that insist on shipping friggin PRIORITY MAIL and bleep the cost. I'm holding off on purchasing a newly released book that has been years in the making because of this. The book is already $100, then they want to charge me $20 to ship it PRIORITY - when it would cost under $5 to ship it MEDIA MAIL. I shipped several rather large boxes of books from California to Georgia recently for $20 per box, and these idiots want to insult my intelligence by charging me $20 to ship ONE BOOK?
I'll just wait - it'll be available elsewhere soon enough, and yes I did tell them what I thought of their shipping charges!