FWIW, there is a note on the tomato page that warns you your password will be different when moving from dd to tomato. It tells you how to extract the PW BEFORE flashing to tomato.
Like previously suggested, a 30 second reset should get you back to defaults on the pw assuming the flash went well.
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www.polarcloud.com/tomat ··· ord_workIf you're upgrading from the DD-WRT firmware, telnet into the router *before* upgrading and type "nvram get http_passwd". The result will be your password in Tomato. This is necessary because of a change in DD-WRT's way of using the standard http_passwd variable.