Having some free time I’ve found 2 neat tools for my WM5 based Vario:

• Sidplay for Windows CE / PocketPC - as the name says, this is the player of Commodore 64 music files, known as sids (.sid extension - SID was the chip responsible mainly for sound on Commodore 64). The quality is quite nice and it is great feeling to hear Last Ninja 3 or some cult scene musics once again :). Of course there is great SidPlayerW for Windows. To get .sids, just visit HVSC - biggest and greatest Sid collection ever.
• XnView Pocket - very nice picture browser and converter for Windows Mobile. It is much more convenient to use than default file browser or TCPMP (which is great for movies anyway).