I dont have a 9890 but have an 11880 which I monitor with "Epson LFP Remote Panel" on a i7 hackintosh/macpro clone. It does all you've mentioned -- check and print ink status, last 10 obs, have emails sent to you after each print, etc... Just install it and then run it and select "Printer Watcher" from the list of available functions. I downloaded it from the epson site, there's a Mac OS X Snow Leopard section...
It would surprise me if it didn't work with the 9890.