My SIP # is 1-747-006-2846
It's not enabled for call-in, so don't try calling it with a regular phone. If you have a softphone and an account on SIPPhone.com (or a LJTalk phone) you can try to call me. I'm not sure how things work if you're using a different SIP server.
rednite put together these notes for using other SIP clients. I may set up a different SIP client if it makes it easier to call people who aren't using linked LJTalk SIP services.