Windows 

"Windows Server 2008 Standard" Edition (x64, with Hyper-V)
"Windows Server 2008 Enterprise" Edition (x64, with Hyper-V)
"Windows Server 2008 Datacenter" Edition (x64, with Hyper-V)
"Windows Web Server 2008" Edition (x86 and x64)
"Windows Storage Server 2008" Standard Edition (x86 and x64)
"Windows Storage Server 2008" Express Edition (x86 and x64)
"Windows Unfified Data Storage Server 2008" Edition (x86 and x64)
"Windows Small Business Server 2008" (Codenamed "Cougar") (x64) for small businesses
"Windows Essential Business Server 2008" (Codenamed "Centro") (x86-64) for medium-sized businesses [17]
"Windows Server 2008 for Itanium-based Systems" (IA-64) (same features as Datacenter Edition)
"Windows Server 2008 Standard without Hyper-V" Edition (x86 and x64)
"Windows Server 2008 Enterprise without Hyper-V" Edition (x86 and x64)
"Windows Server 2008 Datacenter without Hyper-V" Edition (x64)
"Windows HPC Server 2008" (High Performance Computing, previously Compute Cluster Server)
Most editions support "core" installations
Windows 2008 Hyper-V stand alone SKU
"Windows Home Server R2" (based on 2008? Dont think so)
"Windows mobile 6.1" Q1 2008
"Windows mobile 6.1 Professional" q1 2008
"Windows mobile 7" RTM Q4 2008 (First phones in 2009, just 1 edition!)
"Windows CE" 7 ?
"Windows Mobile for Automotive" 6.0? -> "Microsoft Auto" 2.0?
Windows Vista Service Pack 1
Windows Vista for Embedded Systems
Windows Vista Media Center Update (Fiji) I expect at least a beta
Windows Vista Ultimate Extra's ....
Windows Steady State 2.5
Windows XP Service Pack 3
Windows 7 Beta (Codename Vienna)
MinWin beta (Windows 7 kernel based mini OS)
Internet Explorer 8!

SQL Servers 

SQL Server 2008 standard Edition
SQL Server 2008 Enterprise Edition
SQL Server 2008 Express Edition
SQL Server 2008 Workgroup Edition
SQL Server 2008 Developer Edition
SQL Server 2008 Compact Edition?
ISA Server 2008 standard Edition x64
ISA Server 2008 Enterprise Edition x64
Biztalk Server 2008 Enterprise Edition
Biztalk Server 2008 Standard Edition
Biztalk Server 2008 Branch Edition
Biztalk Server 2008 Developer Edition
Search Server 2008 (standard Edition)
Search Server 2008 Express Edition
WSUS 3.0 SP1
Exchange 2007 Service Pack 2 beta
Finaly a new Microsoft Identity and Integration Server?
Host Integration Server 2008 ?
Commerce Server 2007 R2 ?

Forefront

Intelligent Application Gateway 2007 R2?
Microsoft Forefront codename "Stirling" Beta

System Center

ServiceDesk 2008
Mobile Device Manager 2008
Capacity Planner 2007 with sharepoint 2007 support
Application Virtualization 4.5 (softgrid)
Desktop Optimization Pack for Software Assurance
Diagnostic and Recovery Toolset 6.0 (DaRT)
Operations Manager 2007 SP1 (Q1)
Configuration Manager SP1 (H2)
Configuration Manager 2007 R2
Virtual Machine Manager 2008 R2
System Center Online Services
"Microsoft Deployment" Solution Accelorator update for WS08 RTM

Office

Office 14 Beta ?
Office Live Workspace launch

Dynamics

CRM 4.0 general availability (it just RTM'd)
Point of Sale 2.0 sp1

Consumer

Encarta 2009
Money 2009
Streets and Trips 2009

Hardware

Probably new mice ;-)
Zune firmware 2.3
Zune Phone?

Xbox

HD Video for Europe

Windows Live

Windows Live Messenger 9.0

Visual FoxPro

Visual FoxPro version 9 service pack 2 is last that was released for this product (oct 2007), no Foxpro 10, version 9 is end of life in 2015

Visual Studio

Visual Studio 2008 SP1?