OFono, new Open Source project for developing an open source
telephony solution has just be announced by Nokia and Intel.

oFono.org is a place to bring developers together around designing an
infrastructure for building mobile telephony (GSM/UMTS) applications.
oFono.org is licensed under GPLv2, and it includes a high-level D-Bus
API for use by telephony applications of any license. oFono.org also
includes a low-level plug-in API for integrating with Open Source as
well as third party telephony stacks, cellular modems and storage
back-ends. The plug-in API functionality is modeled on public
standards, in particular 3GPP TS 27.007 "AT command set for User
Equipment (UE)."

Source code is available on http://ofono.org/downloads and a high-level
architecture diagram is available on http://ofono.org/documentation. To
join the mailing list, go to http://lists.ofono.org/listinfo/ofono.

Note there are similar projects around such as freesmartphone.org (FSO) or Pyneo.

I wonder how will this interact with Intel's Moblin or Nokia's Maemo plus QT(opia) , same question for other GNU/Linux devices such as android or openmoko...

UPDATE:

The cooperation resulted into a merge of the both distributions now called meego, check http://meego.com