well, it'll be small amounts of data / flags, and the data is usually encrypted - but if its like the pokemon rumble figures, you can pull the data off as XML using an android reader - its just not usable unfortunately.
NFC tag info:
RF technology: Type A (ISO/IEC 14443 Type A)
Tag type: Topaz NFC IC
Manufacturer: Innovision Research and Technology Plc (UK)
ATQA: 0c00
Header ROM: 124c
Maximum message size: 454 bytes
Memory size: 512 bytes
Page size: 8 bytes
Number of pages: 64
Data pages:
Data page 0 contains the UID, and is locked.
Pages 1-12 are unlocked and writable.
Page 13 is reserved and locked. Page data is always set to: 0x5555aaaa124c0600
Page 14 contains the lock bits/OTP, and is locked. Page data is always set to: 0x01e0000000000000
Page 15 is unlocked and writable. Page data is always set to: 0x000000000000ffff
Pages 16-63 are unlocked and writable.