I know what you mean. I blame students that are off school/college for Easter, but then again that's my answer to everything Oddly, I think my yahoo spam has gone down a bit for now.
protip: use www.spam.la if you need to enter an email address for the mp3 download from your cornflakes box (for example!) on the other hand i think because of the strong filters my email provider provides some emails that i should have received i didn't. but i doubt i would have gone through the trouble of browsing through 300+ spam mails in order to find some important stuff (in case the filters would have not been active).