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T-SQL: Easy way to check for existence of a temp table

Normally I'd do something like selecting from sysobjects to find if a temp table exists, but I found this little gem to drop a global temp table at the start of a query (in case it wasn't cleaned up in the previous execution):

IF(object_id('tempdb..##tmpTable') IS NOT NULL)
DROP TABLE ##tmpTable
GO


I'm sure you can come up with a better way to do this rather than using a global temp table, but a local one wasn't going to work in this context since I was using a combination of EXEC and OpenQuery to select from Active Directory, and regular local temp tables seem to disappear upon leaving EXEC, perhaps due to the connection changing or something?

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