If you've got the latest v9.2, you can rotate pointlabels as follows. Pointlabels were enhanced in v9.2, and I'm not sure if this capability was available in earlier releases.
(I strongly encourage everyone to use the latest/greatest version of SAS/Graph, because there are always lots of nice fixes & features added in each version!)
symbol1 v=dot i=none pointlabel=(h=8pt a=90 "#name");
proc gplot data=sashelp.class;
plot height*weight=1;
run;