You’ll have probably found it by now, but for anyone else, on Windows it’s typically under your Windows install directory in .\System32\drivers\etc\hosts. On Android it’s under /system/etc/hosts, but you need root access to edit it.
Edit: just remembered, you’ll probably need elevated access on Windows boxes as well, and this can get a bit tricky on Vista. Right-click on your notepad icon and select “run as administrator” (which you’ll only have if your account has admin privileges). Then open the hosts file from the above path inside notepad and edit it there.
You’ll have probably found it by now, but for anyone else, on Windows it’s typically under your Windows install directory in .\System32\drivers\etc\hosts. On Android it’s under /system/etc/hosts, but you need root access to edit it.
Edit: just remembered, you’ll probably need elevated access on Windows boxes as well, and this can get a bit tricky on Vista. Right-click on your notepad icon and select “run as administrator” (which you’ll only have if your account has admin privileges). Then open the hosts file from the above path inside notepad and edit it there.