From: Piotr GasiorowskiFrom: Urban Lindqvist
[...] /ɧ/, /ʂ/, and /ç/.
The last one is pretty straightforward and exhibits only little variation (affricate [cç] in some areas). Phonetically, it's not a German [ç] as in 'ich', but rather a sound intermediate between [ç] and [ʃ], something like [ʃʲ] (or [ʧʲ]), pretty close to (a shortened) Russian <щ>.
Much of this is beautifully parallel to various Indic stuff, isn't it?
A nice thing with the Swedish retroflexes is that they are part of what might be described as a completed sound change that is given prolonged life through sandhi: Ser du'n? (Standard Swedish Ser du honom?) 'Do you see him?' [seːɖɵn], Det tar tid 'It takes time' [detαːʈiːd], etc. -- also kind of a parallel (cf. Old Indic e, o /_C ~ ay, av /_V).