I'm mining on wemineltc.com with cudaminer right now. I'm pretty new at all this so took me a while to get it working. You need to use the stratum proxy and launch it with these parameters
-pa scrypt -o eu.wemineltc.com -p 3333
You can just right click on stratum_proxy.exe and create a shortcut. Right click the shortcut and open properties and paste those settings at the end of the target box.
Do the same thing with cudaminer but paste these settings
-o 127.0.0.1:8332 -O username:password -a scrypt
Remember, the username has to be the miner name you setup on wemineltc.com
You just need to launch the proxy first and then cudaminer, both with the shortcuts you made.