Unix.LoveLetter is the VBS/LoveLetter.A virus that is ported to a generic unix shell script and contains the functionality of the original Windows e-mail worm.
Unix.LoveLetter is not widespread at all.
Information about the original VBS/LoveLetter.A is available at: http://www.F-Secure.com/v-descs/love.shtml
Disinfection & Removal
Allow F-Secure Anti-Virus to disinfect the relevant files.
For more general information on disinfection, please see Removal Instructions.