Lots of.. I don't know the exact number but they must be over 250. I use separate password for each site/forum etc.
I use almost a different password for different sites, and in the autofill feature of Fx, i have saved about ~220 passwords. And i don't store passwords for sites like : paypal, ebay and moneybookers [just try to remember them] Thanx, Shadab.
I lost count of the login names and passwords. I was so afraid to lose my passwords one day ( I am using firefox and it remembered all the names and passwords I used on different sites ) that I installed the utility that exports the passwords and backed them up! If anyone is interested, the add-on for firefox is called "Password Exporter".
Around 80+ to 90 I guess, I have a password manager for all this. Heck most of them aren't being used anymore it just keep stacking up from many websites.