I sort my spam carefully into various categories. For example, email that wasn't sent to my email address, gets short shrift.
I've just added a new category - nonroman. This is to collect all the spam that's in Japanese, Chinese or any other character-set that I don't have a hope in hell of reading, so I can just delete it all at once.
I've added this category because of the increasing about of spam I'm getting in Japanese and Chinese.