If you are a regular reader of these guides you will have probably have heard scare stories about Paypal. It is difficult for international sellers not to use Paypal, but here are links to (detailed) guides referring to Paypal scares.
Fake Paypal emails: http://reviews.ebay.co.uk/SCAM-WARNINGS_W0QQugidZ10000000001900192
False claims of paying by Paypal: http://reviews.ebay.co.uk/BE-CAREFUL-ALWAYS-CHECK-YOUR-PAYPAL-ACCOUNT_W0QQugidZ10000000000743209
Paypal account disappearing: http://reviews.ebay.co.uk/BEWARE-MISSING-PAYPAL-ACCOUNTS_W0QQugidZ10000000000924535
Note: This list is not complete by any means.