If you are going to paste to an IRC channel other than #lisp (or don't want a channel announcement): use the link http://paste.lisp.org/new and select the right channel instead of #lisp.
The lisppaste Application which powers it is an IRC bot (Lisp IRC Bots) designed to eliminate lengthly flooding pastes by providing each with a URL and an announcement to the channel it runs on. Lisppaste 2.2 features persistent pastes, paste annotation, a web interface to the list of all pastes in the system, multiple channel support, RSS support, and XML-RPC support. It's built on SBCL, cl-irc, and araneida.
New in lisppaste 2.3 over 2.2 is a whole bunch of stuff. (Really. I don't even remember all the changes I made.) New in lisppaste 2.2 over 2.1 is enhanced RSS, specified URLs for specific channels, faster serialization, and XML-RPC. New in lisppaste 2.1 over 2.0 is RSS support and support for linking to meme logs.
Repository at https://gitlab.common-lisp.net/groups/lisppaste.