*AWR introduces : Analog Office 2004 and VSS 2004*

New Product Releases. AWR Announces Analog Office 2004 Next-Generation Analog & RFIC Design System:
http://www.mwoffice.com/news/press/PR040517.html

and, it is on that page, but i think it is important, so sorry for duplicating a part of that page:

Complete Front-to-Back Analog and RFIC Design System

The Analog Office unified design environment fully interacts with a comprehensive and powerful set of integrated tools, including:

Easy-to-use graphical user interface (GUI) supporting
System-level and circuit-level design methodologies
Electrical and physical design, schematic capture, simulation/analysis, and layout and verification
Frequency- and time-domain simulation and analysis
Links from design to test
Integrated waveform display & analysis capabilities supporting complex RF measurements
Support for different types of simulation
System simulation with Visual System Simulator? (VSS) design suite
Time-domain simulation with Synopsys' HSPICE?
Frequency-domain simulation with AWR's harmonic balance simulator
EM simulation with AWR's EMSight? software tool
Open platform for third-party tool integration
SPICE socket for third-party SPICE-based circuit simulators
EM socket for third-party EM simulators
Powerful and easy-to-use physical design suite
Fully interactive layout editor supporting polygon editing and parameterized layout cells
Automated device-level placement and interconnect routing
Integrated and interactive design rule checker (DRC)
3-D full field solver-based extraction with industry gold standard, high-speed extraction technology from OEA International

Coupled with industry leading semiconductor foundry design kits for silicon germanium (SiGe), and RF complementary metal-oxide semiconductor (CMOS) processes as well as gallium arsenide (GaAs), Analog Office software is the first completely new system in over a decade delivering concept-to-verification design capabilities.

marti

The biggest change I've seen is in the link budget simulator in VSS.