The Alguerese reference article from the English Wikipedia on 24-Apr-2004
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Alguerese

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Alguerese is the variant of Catalan language spoken in the city of Alghero, in the north-east of Sardinia. Catalan invaders repopulated the town after expelling the autochthonous Sardinian population in 1372, following several revolts. Catalan was replaced as the official language by Spanish in the 17th century, then by Italian. In the 1990s about 60% of locals still understood spoken Alguerese, or Algherese Catalan.

The Algherese dialect has many deviations from standard Catalan. Some of the most obvious:

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