I recently started paying closer attention to the unhandled exceptions that are occuring on dustyd.net. My error log is FILLED with ArgumentExceptions, FormatExceptions & HttpRequestValidationExceptions, all caused by spam bots. Take for instance this one:
Look closely and you'll see that it's someone trying to stick a spammy link value into a CHECKBOX! The only thing I can think of is some sort of automated spider running that just finds any and all form fields, and sticks spammy URLs into them.
Those errors are probably easy enough to fix. I'll just disable request validation, and validate the fields myself. I just find it amazing the lengths that spammers will go to. I suppose spidering blogs and inserting comments doesn't really take much effort.