I added a template using,
STSADM -o addtemplate -filename "C:\Stalker\BaleeeBaleee.stp" -title "YouBreakLive"
I can see it in Central Administration in "Custom" site templates when I try to create a new site collection, but after execution of command it says,
Operation completed successfully.
IIS must be restarted before this change will take effect. To restart IIS, open a command prompt window and type iisreset.