Full recovery and no log backups?
Was the log getting manually truncated? (backup log .. truncate only)?
Is the database still attached to SQL? (I know the mdf is missing). Is it still listed if you query sys.databases?
p.s. How do you lose an mdf file?
Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability