Check out:
Route Views Project Page
I stumbled across this and thought I'd share it. This website lists telnet access into a Cisco router with a full BGP IPv4 routing table. If you're just plain curious, connect to it and have a play! It's great to demystify what an Internet router with a full BGP table looks like.
The device seems to be an ASR1004 running IOS-XE. Seems to have 10 GB of memory?
cisco ASR1004 (RP2) processor (revision RP2) with 9891715K/6147K bytes of memory.
