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The DBA_FREE_SPACE view will show you how much free
space has not been allocated in a tablespace.
Unfortunately as you've found out, when you delete
data from a table you do not reset the HWM. You also
do not free up any space in any extents for that
table.
To get more accurate measures of the amount of actual
space in a table, use the DBMS_SPACE package,
particularly the UNUSED_SPACE procedure of this
package. This will tell you how much space *below the
HWM* is in the table. For more information on this
procedure, refer to the Oracle docs
(http://technet.oracle.com/docs/products/oracle8i/doc_library/817_doc/appdev.817/a76936/dbms_sp2.htm#1002300).
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