Move SAN Volume (Boot-Volume) to Local Disk

Create an image of it with Acronis (or HP RDP / ICE etc) should work fine, it's how some people get the bootable image on the SAN in the first place. Assuming it's a Proliant the drivers for the internal RAID card should already be there if the PSP is installed, if not and you're adding a RAID card then add it physically first and install the drivers so they will be on the image. Hopefully you haven't got windows dynamic disks.

I already had a try with Acronis but it went into a bluescreen - like "missing or corrupt winboot.exe". Maybe I could repair it with the Windows CD but it leaves some doubt wheather it is fine.

you should try Symantec's Backup Exec System Recovery
or try to repair the OS

System Recovery I would have to get a licence for 10 or more server only to move the volume.

winboot.exe? you don't want that on your system it's a trojan.

Winload.exe more like, For pre win2008/Vista you had to tweak boot.ini to point to the right boot partition/disk, I generally look at one on a running one and copy a few entries from that and add them to the current boot.ini, then have a load of choices one of which will be right, then edit boot.ini to set that one to default.

Not qute as simple with 2008 though, probably have to use easyBCD to edit the boot config - http://en.wikipedia.org/wiki/EasyBCD

Of course I meant winload.exe! This tool seems to be one which could help. But I don't know how to run it without OS.