Pronunciation, Vocabulary, Grammar 

http://mowicpopolsku.com/ - "to speak Polish", vocabulary and pronunciation!
http://www.apronus.com/learnpolish/polishsounds.htm - alphabet, pronunciation (audio)
https://www.apronus.com/polishlessons/lekcje.htm - sentences (audio)
http://www.slavic-net.org/main.php - alphabet, pronunciation (audio): go to PL, then "Witamy"; Polish dialogues (audio), several topics; go to PL, then "Moduły"
http://www.dicts.info/vocabulary/?l1=polish - vocabulary with pictures, by topics
http://www.dicts.info/vocabulary/index3.php?l1=polish - vocabulary with tooltips
http://mylanguages.org/learn_polish.php - vocabulary (audio, pictures), grammar
http://www.languageguide.org/angielski/ - vocabulary (audio, pictures)
http://www.languageguide.org/user/wiki.jsp?lang=pl - pictorial wiki
http://www.digitaldialects.com/Polish.htm - vocabulary (audio) and games
http://www.learnpolishfeelgood.com/vocabulary/index.html - vocabulary training, by topics
http://www.apronus.com/polishlessons/lekcja01.htm - sentences (audio)
http://www.tastingpoland.com/language/index.html - complete conjugation of 474 infinitives
http://en.bab.la/conjugation/polish/ - verbs and conjugation
http://polish-bilus.blogspot.com/ - blog about Polish Language, grammar

Exercises and Tests

http://www.learnpolishfeelgood.com/index.html - verbs, adjectives, nouns and pronouns
http://www.dicts.info/vocabulary-trainer.php?topic=Fruit&disa=0 - vocabulary trainer
http://www.transparent.com/learn-polish/proficiency-test.html -Polish Proficiency Test for self-evaluation
http://www.oneness.vu.lt/pl/lesson1/grammar/ - ten lessons onlne; also see Navigation

Polish Characters

http://polish.typeit.org/ - type Polish characters without a Polish keyboard  

Translation Page

http://translate.google.com/?hl=en&eotf=1&layout=2&sl=en&tl=pl# - use with caution!

Dictionaries 

http://en.bab.la/dictionary/polish-english/polska - a very good dictionary
http://www.eudict.com/?lang=engpol&word=house - PL/ENG words and expressions
http://pl.thefreedictionary.com/ - PL/ENG/MORE
http://lingro.com/dictionary/ - an interesting dictionary
http://www.dicts.info/ - look up translations for__ in__; large dictionary connected with Wikipedia
http://diict.com/ - PL/ENG/MORE
http://poradnia.pwn.pl - good site for advanced users, but difficult to navigate
http://www.pogonowski.com/Slowniki/pol-ang/pol_ang.php?searchWORD=mianownik - PL/ENG dictionary

Other Educational Links

http://pl.wikipedia.org/wiki/J%C4%99zyk_polski
http://en.wikipedia.org/wiki/Polish_grammar
http://en.wikibooks.org/wiki/Basic_Polish_language_course
http://en.wikipedia.org/wiki/Polish_language#Nouns_and_adjectives 
http://www.poland.gov.pl/The,Polish,Language,317.html
http://blogs.transparent.com/polish/ - go to: "Polish Archives and Categories"
http://www.wiking.edu.pl/article.php?id=599 - orthography
http://www.wiking.edu.pl/article.php?id=600 - punctuation
http://www.let.rug.nl/~houtzage/poohpolengpart1.html -"Winnie-the-Pooh" (audio)
http://www.let.rug.nl/~houtzage/alicepolengpart1.html - "Alice in Wonderland" (audio)
http://polish.slavic.pitt.edu/firstyear/nutshell.pdf - "Polish Grammar in a Nutshell" by Oscar E. Swan
http://polish.slavic.pitt.edu/grammar.pdf - "A Grammar of Temporary Polish" by Oscar E. Swan
http://polish.slavic.pitt.edu/ - Polish Language Website, Pittsburgh, PA
http://faculty.las.illinois.edu/gladney/Elementary_Polish/Start.html - "Elementary Polish" by Ron F. Gladney
http://www.seelrc.org:8080/grammar/mainframe.jsp?nLanguageID=4 - "A Concise Polish Grammar" by Ron F. Feldstein
http://archive.org/stream/elementarypolish00ssymuoft#page/n3/mode/2up - "Elementary Polish Grammar" by Paul Ssymankold (1921)

About Polish Culture

http://polmap.republika.pl/dynastie.html - Polish history
http://www.wiking.edu.pl/article.php?id=54 - kings and princes of Poland
http://www.krykiet.com/polish_food.htm - Polish food (recipes in English)