Between RH7 and betas for RH 7.1 release Polish aspell dictionary (aspell-pl-0.1-6.i386.rpm, as opposed to "pt") was mysteriously murdered.
It was removed because we needed the space, and it is currently too big. If you want it back, the best thing to do would be help implementing suffix compression in aspell.
I guess that you should ask for that one of your developers or beta testers from Poland. OTOH Polish seems to be in use by a tad bigger group than Catalan, for example (not that I have anything against Catalan and this dictionary is smaller :-).
Catalan is one of the major languages in Spain, which is one of our tier one markets. Also, the dictionary is a fifth of the size. The other dictionaries which got axed were aspell-cs (30 MB) and aspell-eo (10 MB).