Although not considered to be a critical threat, (it actually asks the user for permission to spread!) this proof-of-concept virus is certainly getting some attention from the anti-virus industry.
From F-Secure ...
Duts is a parasitic file infector virus. It is the first known virus for the PocketPC platform. Duts affects ARM-based devices only. Duts is a 1520 bytes long program, hand written in assembly for the ARM processor. When an infected file is executed the virus asks for permission to infect.
When granted the permission, Duts attempts to infect all EXE files in the current directory. Duts only infects files that are bigger than 4096 bytes and have not been infected yet. As an infection marker the virus writes the string 'atar' to the Windows Version field of the EXE header.
Read more on F-Secure's site
Duts info from Sophos
From Symantec's site