As I write this, Sway is at position 666.
But here's a brief explanation for people reading this who aren't weird, specialised geeks/losers like myself. Sway (like most of the bots on the list) is an 'eggdrop' IRC bot. That's an automated IRC client for channel management.
The list is basically a list of bots (some are EnergyMech, not Eggdrop) and their relative uptimes. There are usually well over 32,000 bots on the list, transmitting their current uptime via a specific module which you install.
Fun stuff, eh?