What are the changes for null from 6 to 7

I already found that in 6

SELECT * from prebatch LEFT OUTER JOIN accounttransact ;
ON prebatch.icashid = accounttransact.icashid ;
WHERE accounttransact.wayne <> "bobo" ;
GROUP BY accounttransact.cinvoice ;
INTO CURSOR tbatchtmp


returns all the records where wayne <> 'bobo' and where wayne is null

in 7, it works correctly and returns only records where wayne <> 'bobo' (ex: wayne = 'PH')

evidently, null <> 'bobo' = .T.

Are there any other gotchas?