Too lazy to repeat myself so I'll just copy&paste the discussion from IRC between me, Jens and Lennart:

<zeenix> basically to have gssdp run as service on system bus
<zeenix> 2 pros
<phako> yes
<zeenix> 1. local caching of all resources on the network and hence faster discovery for UIs
<phako> you know that KDE already has sth like that?
<phako> written by my collegue?
<zeenix> 2. on demand loading of devices
<zeenix> yes, i remember but i haven't really looked into that
<zeenix> currently user have to login to get his rygel instances started
<zeenix> currently its annoying me cause i have to do it myself everyday :)
<phako> ;)
<phako> saw the comment on the pilips bug?
<phako> fixing m-search seems to do the trick as well
<zeenix> so i was thinking of having gupnp register its devices/services with gssdp parmanently
<zeenix> or at least as an easy option
<phako> well I'd like to have DBus as an option
<zeenix> and then gssdp launches devices (e.g rygel) when there is a m-search for that
<phako> i.e. a gssdp that can still be used stand-alone
<zeenix> why? i think its ok to require system bus these days
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<phako> zeenix: systems without a bus? 
<phako> like
<phako> windows?
<phako> embedded stuff without bus?
<zeenix> former is a good question
<zeenix> but latter, i'm not sure. is dbus too much to ask if we are require gobject/glib etc ?
<zeenix> s/require/requiring/
<phako> apparently yes
<zeenix> for windows, we have this awesome german dude that will port it using something that exists on windows :P
<phako> there was some talk about telepathy 
<zeenix> also, how does avahi do it?
<phako> in some small helsinki based company doing embedded linux
<phako> :-P
<phako> zeenix: what?
<zeenix> i mean doesn't avahi depend on dbus?
<phako> IIRC yes
<zeenix> hmm.. thinking about it, we could make it an optional feature 
<zeenix> mezcalero: i think you want to participate in this discussion :)
<phako> zeenix: sven will probably have a word in that as well
<zeenix> heh
<zeenix> not if its kept optional :)
<phako> probably 
<mezcalero> zeenix: wassup?
<mezcalero> gio includes a dbus implementation anyway
<mezcalero> so why bother?
<zeenix> mezcalero: you mean leave the portability to gio?
<phako> wait, gio has a dbus-server?
<zeenix> phako: server-side api
<zeenix> mezcalero: do you know if there is any way to launch an app as a particular user? preferably launching a new session as well?
<phako> without using systemd for now
<phako> ;)
<zeenix> phako: i have nothing against using systemd
<zeenix> phako: this is something for the not very immediate future
<mezcalero> phako: i'd assume gdbus has an equivalent of DBusServer
<mezcalero> phako: but not for dbus-daemon
<mezcalero> zeenix: what are you trying to do?
<mezcalero> you can use systemd's user management of course
<mezcalero> i'd encourage you to do that
<mezcalero> you can roll your own stuff of course
<mezcalero> for example avahi drops privs on its own
<mezcalero> on fact avahi is pretty hardcore, and is still (together with rtkit) the only daemon which chroots by default
<zeenix> <zeenix> basically to have gssdp run as service on system bus
<zeenix> <zeenix> 2 pros
<zeenix> <zeenix> 1. local caching of all resources on the network and hence faster discovery for UIs
<zeenix> <zeenix> 2. on demand loading of devices
<zeenix> <zeenix> yes, i remember but i haven't really looked into that
<zeenix> <zeenix> currently user have to login to get his rygel instances started
<zeenix> <zeenix> currently its annoying me cause i have to do it myself everyday :)
<zeenix> mezcalero: thats what i am trying to do :)
<mezcalero> well, yren't you reading LWN, aka "Lennart's Weekly News"?
<mezcalero> lemme find a link for you
<zeenix> mezcalero: i also had this idea that you might not like: gssdp intergration with avahi :)
<zeenix> i'm hardly reading any news :)
<mezcalero> http://lwn.net/Articles/441328/
<mezcalero> if you look at that outline, we actually plan to make it possible to run user services outside of a login
<mezcalero> with systemd
<zeenix> cool, thats exactly what i need
<zeenix> s/i/we/