November 7th, 2012Edit
[05:10] == Watcher_ [email@example.com] has joined #BMS-ARG [05:11] <Watcher_> W1tQcm94eWhvU3RALTg0LTktSTIzLTM0NS5kc2xnYi5jb20vL2Nsb3NlZC5wcm94eS5hY2NlcFRFZC8vP09UUiwzLDQsP09UUjpbSU5DT01JTkcgVFJBTlNNSVNTSU9OXVRoRXBJelphSXNhTGlFLi4uSEFMT1NbVHJhbnNtaXNzaW9uIEVuZHNdXQ== [05:11] == Watcher_ [firstname.lastname@example.org] has quit [Quit: Page closed]
[[ProxyhoSt@-84-9-I23-345.dslgb.com//closed.proxy.accepTEd//?OTR,3,4,?OTR:[INCOMING TRANSMISSION]ThEpIzZaIsaLiE...HALOS[Transmission Ends]]
It can be accessed with the URL http://thestormseeker.com/thepizzaisalie/HALOS.txt
Also note that the capitalized letters in the decoded message (sans the first "P") spell out: SITE. This is obviously just another indication that the website should be visited.