It looks like a new version of Wireshark has been released.  In this release they have fixed the bugs in Tektronix K12 and NetScreen file formats as well as some other bugs.  They have not added any new protocols with this release but have updated support for AFS, ATM, DHCPv6, DIS, E.212, RTP, UDP, USB, WCCP, WPS protocols.

http://www.wireshark.org/security/wnpa-sec-2009-01.html

They also have released an experimental package for Mac OS X 10.5.5 and above. 

For a complete list of changes you can look at the Wireshark Release Notes.

http://www.wireshark.org/docs/relnotes/wireshark-1.0.6.html