Not an alphabet, but a nice phonology overview of Ösjke:
http://img214.imageshack.us/my.php?imag ... ogyjx7.jpg
http://img248.imageshack.us/my.php?imag ... ogyqf0.png
A few additional explanations:
1) In fact the palato-alveolars are rather post-alveolar sounds, but they are pronounced so softly, that they nearly sound like palatals.
2) the retroflex consonants are also rather post-alveolars, but they are pronounced rather normal so that they sound very similar to retroflex consonants and clearly different to the "soft" post-alveolars
3) the velar friccatives can also be pronounced as uvular friccatives, but that's optional
4) sounds in brackets ( ) are only possible allophones in some positions ("z" for "s" / dark "l" for normal "l")
5) [r] often gets vowelized after vowels (as in German), so that there might be some more diphthongs: [aɐ] [ɔɐ] [ɛɐ] [eɐ] [iɐ] [ʊɐ] [œɐ] [ʏɐ] [yɐ]
Because of the fact that they're only allophones for [ar], [ɔr], [ɛr] and so on, they are not regarded as true diphthongs.
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edit:
I have a little problem with making the picture appear instead the link, maybe someone could help?!