The natural evolution of PCI based telephony boards is to have Ethernet as the network interface instead of a PCI interface that requires a driver interface to work with the application - effectively making a Asterisk Blade. In this way the adapters can work with ANY SIP based application. This will greatly simplify the time to market and general appeal of internal cards in general.
In June 2009 Positron Telecommunication Systems Inc started shipping the first of this kind of Asterisk Blade and now has a full portfolio to address the business market:

Benefits

No lengthy process to install Linux, Asterisk, Zap
Asterisk runs on the card, so it can run on any operating system that has a PCI slot
Can interface to any application that send SIP traffic
Ideal for VMWARE applications


V-114 PCI
4 FXO, 1 FXS, Ethernet, on board Echo canceller, Compact Flash for media storage and all this powered by Asterisk
http://www.positrontelecom.com/en/prod_details.php?id=prod1229540276&c=125&s=131

V-214 PCI
4 ISDN Bri,1 FXS, Ethernet, on board Echo canceller, Compact Flash for media storage and all this powered by Asterisk
Additionally support remote CAPI
http://www.positrontelecom.com/en/prod_details.php?id=prod1229540747&c=125&s=134

V-310 PCI
1 E1/T1, 1 FXS, Ethernet, on board Echo canceller, Compact Flash for media storage and all this powered by Asterisk
http://www.positrontelecom.com/en/prod_details.php?id=prod1229541123&c=125&s=135

Distributors

Europe

• IPChitChat European Distributor of Positron blades Positron V114, Positron V214, Positron V310, Positron V600