In Arduino v0.23 when I open the Serial Monitor it prints 'Start'.
I swipe a tag over the reader and it prints the tags ID (a 8 digit/character hex key).
It then goes back to seek mode.
In Arduino v1.0 when I open the Serial Monitor it prints 'Start'.
I swipe a tag over the reader and nothing happens.
On the evaluation shield for the RFID module there are LEDs to show that it's searching/seeking a tag and an LED for when it finds a tag.
On both sketches the evaluation shield goes into seek mode and also registers when a tag is swiped.
The difference seems to be whether it prints it out or not.