In this awesome update deank has introduced the ability for you to share files from PS3's connected via LAN and/or over the internet. Yes! Transfer files from your PS3 to any PS3 in the freaking world! Not only that but you also have the ability to use files/games/movies from server side on your client based PS3. Here is more from the developer himself...
About multiMAN 14.15.00:
Some of you used "Network Servers" option in "Settings" to connect to a PC running ps3netsrv to copy files, play ROMs, play music or view pictures.
Now it is possible to connect to ANOTHER PS3 (running mM 04.15.00) be it in your local LAN or anywhere in the world.
You can copy/share data with another PS3 if the 'server' PS3 is running mM 04.15.00 and the 'client' PS3 can be using mM 04.00.00 or later.
You can backup games directly from the BD Disc of the server PS3, view photos, play music, install PKG files, copy games, access all devices connected to the server PS3, if you're on cobra cfw you can even play PS1/PS3 games or Blu-ray/DVD movies stored on the server PS3.
You can transfer game backups, movies and data from one PS3 to another without a USB drive or PC.
All in all - you can transfer/share data between to PS3s on CFW via the /net_host feature of multiMAN.
Deank @ Ps3Crunch Forums
It means that you connect to a friend's PS3 and help him if you're more experienced with mM or just have fun controlling your other PS3s in the house. Both sides must run compatible multiMAN versions (04.15.00 or later)
Source: deank via ps3crunch
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Thanks to Datalife for the news tip!