Bulgar Words and Expressions - Features of the old (Turkic) Bulgar language that have been preserved in the modern (Slavic) language. 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). www.kirildouhalov.net/language/language.html
HPSG-Based Syntactic Treebank of Bulgarian - Project to create a high quality set of syntactic structures of Bulgarian sentences within the framework of HPSG. btb.math.bas.bg
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. www.greekhelsinki.gr/english/reports/pomaks.html