UPDATE: Only 2 hours after posting this and Josh has already told me about another one - a Compress File Task.
He's a one-man SSIS custom task machine :)
Josh Twist it seems has been bitten by the SSIS bug and is beginning to churn out some really useful SSIS add-ins. Witness his Custom Logging Task that I mentioned last month.
Well now he has come up with another. The Set Variable Task. If you find that its a pain setting variable values using script tasks then this is for you for it does exactly what it says on the tin.
Read Josh's write-up of it here.
Great work Josh!
-Jamie