Using 1.4.2_xx and -XX:+AggressiveHeap (or -XX:+UseParallelGC) the option -XX:+PrintGCDetails do not print additional details in the log (e.g: no Perm info) but only the same output as -verbose:gc.
 
% java -XX:+AggressiveHeap -XX:+PrintGCDetails ...
...
[GC 170246K->169990K(229376K), 2.7965704 secs]
[Full GC 201991K->199776K(229376K), 2.9526216 secs]

instead of a detaild output (even if collector is different):

% java -XX:+PrintGCDetails ...
...
[GC [DefNew: 6148K->6148K(7040K), 0.0001235 secs][Tenured: 57432K->57432K(58304K), 0.0587452 secs] 63580K->63576K(65344K), 0.0592469 secs]
[Full GC [Tenured: 57432K->57431K(58304K), 0.3873751 secs] 63576K->63576K(65344K), [Perm : 1002K->1002K(4096K)], 0.3990218 secs]

Using 1.5.x (tested 1.5.0_01-b05) and -XX:+AggressiveHeap the -XX:+PrintGCDetails works as expected (Perm size included)

% java -XX:+AggressiveHeap -XX:+PrintGCDetails....
...
[GC [PSYoungGen: 62720K->8192K(64512K)] 110853K->110597K(187392K), 0.7226347 secs]
[Full GC [PSYoungGen: 8192K->0K(64512K)] [PSOldGen: 102405K->108644K(122880K)] 110597K->108644K(187392K) [PSPermGen: 1379K->1379K(8192K)], 0.1218560 secs]

% java -XX:+PrintGCDetails

[GC [DefNew: 6150K->6150K(7040K), 0.0001351 secs][Tenured: 57440K->57440K(58304K),
0.0961156 secs] 63590K->63584K(65344K), 0.0967162 secs]
[Full GC [Tenured: 57440K->57438K(58304K), 0.3017683 secs] 63584K->63583K(65344K), [Perm : 15K->15K(8192K)], 0.3193614 secs]
###@###.### 2005-1-11 11:20:27 GMT