Post updated : Please check out the comments to download the installer..
1) Close all instances of VS 2008
2) Download the following file and copy the contents into notepad
File: RegFile
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\VisualStudio\9.0\AddIns\Ankh]
“SatelliteDllPath”=”C:\\Program Files\\AnkhSVN\\“
“LoadBehavior”=dword:00000001
“CommandPreload”=dword:00000001
“AboutBoxIcon”=”"
“CommandLineSafe”=dword:00000000
“Description”=”Subversion addin for Visual Studio .NET 2008″
“FriendlyName”=”AnkhSVN”
“SatelliteDllName”=”BitmapDll.dll”
“AboutBoxDetails”=”Please visit http://ankhsvn.tigris.org for more information
Below is the version information for the various AnkhSVN components
AnkhSVN 1.0.2.2778
OpenSSL 0.9.8a
Neon 0.25.5
ZLib 1.2.3
Berkeley DB 4.4.20
Subversion 1.4.5
Ankh 1.0.2Final
apr-iconv 0.9.7
apr-util 0.9.12
apr 0.9.12″
“LoadBehavior”=dword:00000001
3) Save the file with .reg extention
4) Execute the saved file à This shall add an entry to your registry
5) Open VS 2008 and Ankh should be enabled for your solution.
Happy coding 
Why would you want to hack AnkhSVN 1.0.2 in Visual Studio 2008?
AnkhSVN 2.0 is out for over a year and has much better Subversion support for Visual Studio 2005 and 2008.
If you want Subversion 1.6 support, instead of the 1.4 in AnkhSVN 1.0.2 or 1.5 in AnkhSVN 2.0 you can also skip 2.0 and go directly to 2.1.
Hmm.. Cheers Bert – I agree with you on that note. I wasn’t aware an official version of Ankh supporting VS2008 .
For other folks looking for the download, click here
Also, I got the latest for tortoise subversion from here