UPDATE: Be sure to see the (more recent) post, “New Cisco ISR G2 routers (slides)”, as well.

Hmm…

“In Cisco IOS Release 15.0(1)M, this feature was introduced on the Cisco 1941, 2900sm, 2901, and 3900 routers.”

Well now, this certainly looks interesting:

Router# show version

Cisco IOS Software, C3900 Software (C3900-UNIVERSALK9-M), Experimental Version 
12.4(20090904:044027) [guraman-revpi12 577]
Copyright (c) 1986-2009 by Cisco Systems, Inc.
Compiled Fri 04-Sep-09 09:22 by guraman

ROM: System Bootstrap, Version 12.4(20090303:092436) 
[BLD-xformers_dev.XFR_20090303-20090303_0101-53 102], DEVELOPMENT SOFTWARE

C3900-2 uptime is 8 hours, 41 minutes
System returned to ROM by reload at 08:40:40 UTC Tue May 21 1901! 
System image file is "flash0:c3900-universalk9-mz.SPA"
Last reload reason: Reload Command



This product contains cryptographic features and is subject to United
States and local country laws governing import, export, transfer and
use. Delivery of Cisco cryptographic products does not imply
third-party authority to import, export, distribute or use encryption.
Importers, exporters, distributors and users are responsible for
compliance with U.S. and local country laws. By using this product you
agree to comply with applicable laws and regulations. If you are unable
to comply with U.S. and local laws, return this product immediately.
A summary of U.S. laws governing Cisco cryptographic products may be found at:

http://www.cisco.com/wwl/export/crypto/tool/stqrg.html

If you require further assistance please contact us by sending email to
export@cisco.com.

Cisco CICSCO3945-MIDPLN (revision 1.0) with CISCO3900-MPE140 with 987136K/61440K bytes of 
memory.
Processor board ID FHH1231P02Y
3 Gigabit Ethernet interfaces
1 terminal line
1 Virtual Private Network (VPN) Module
1 cisco Integrated Service Engine(s)
DRAM configuration is 72 bits wide with parity enabled.
255K bytes of non-volatile configuration memory.
1020584K bytes of USB Flash usbflash0 (Read/Write)
1020584K bytes of USB Flash usbflash1 (Read/Write)
500472K bytes of ATA System CompactFlash 0 (Read/Write)

License Info:

License UDI:

-------------------------------------------------
Device#   PID                   SN
-------------------------------------------------
*0        CISCO3900-MPE140      FHH1215008L     



Technology Package License Information for Module:'c3900' 

----------------------------------------------------------------
Technology    Technology-package          Technology-package
              Current       Type          Next reboot  
-----------------------------------------------------------------
ipbase        ipbasek9      Permanent     ipbasek9
security      securityk9    Evaluation    securityk9
uc            None          None          None
data          None          None          None

Configuration register is 0x0

Taken from “Digitally Signed Cisco Software” (cisco.com).

Thoughts?