The latest stable version of the Linux kernel is: 2.4.15
The latest prepatch to the stable Linux kernel tree is: 2.4.16-pre1
The latest beta version of the Linux kernel is: 2.5.0
The latest prepatch to the beta Linux kernel tree is: 2.5.1-pre1
The latest -ac patch to the stable Linux kernel series is: 2.4.13-ac8

Alan は氏坊か？