wow, man comes and doesnt get a real answer but a bunch of BS, wheres the mod? anyways, this is what u need.
u need to be rooted. this overwrites the portion in the htc lockscreen apk to not display alerts in lockscreen. this means calls, texts, etc. ull see the icon on ur notification bar tho.
stolen from xda. which is where u really should go to find most hacks. most fixes here are just pasted from there.
book mark this:
HTC Supersonic: EVO 4G - xda-developers
solution here:
[MOD] Remove Bottom Notification Text From Stock HTC Lock Screen - xda-developers