The pronounciation in those samples is not that bad at all. Lector's articulation catches nuances as subtle as węszy vs. węższy. Sounds pretty good to me - the only thing I find irritating in those samples is the slow, slow pace. ("Przed sześciu godzinami" - OK, that one makes me wonder.)

(On a side note, the "up to 1000 characters in a single message" limit is really annoying for verbose guys like me.)

Here's one more resource, this time for more advanced (more or less fluent in reading, that is) Polish language adepts:

http://www.miejski.pl

It's a non-normative, wiki-style Polish slang dictionary (yay!). If you're stuck with a word, you might wanna look it up there.

Hope this will help you in some way. Pozdrawiam!

Dziękuję bardzo.

Grammatical tests: http://www.polishgrammar.com/ A fun educational website - basic grammar, useful phrases, dialogues (written and as wma recordings, might have video but I haven't checked), exercises: http://www.oneness.vu.lt/