Bulgar Words and Expressions  
   Features of the old (Turkic) Bulgar language that have been preserved in the modern (Slavic) language.
   http://members.tripod.com/~Groznijat/b_lang/bl_double.html

Bulgarian Language and Alphabet  
   General information, history and development of the language, alphabet and orthography (with pronunciation guide), simple phrases (with audio files).
   http://www.kirildouhalov.net/language/language.html

The Pomaks  
   Sociolinguistic survey of the Pomaks, a 30,000-strong Muslim Slavic-speaking community living in Western Thrace (Northern Greece). Their language is essentially a Bulgarian dialect.
   http://www.greekhelsinki.gr/english/reports/pomaks.html