I'm pretty sure there is no thread for Oriya. Anyway, I'm not going to currently learning it but I do have any interest in it.
Basic Infoformation
It is an Indo-Aryan language and is closest to Assamese and Bengali. it is native to Odisha, but also has migrant speakers in all the big Indian cities and in big cities accross the world. it also spoken in some parts of Jharkhand. It has 33 million native speakers and is written in the Oriya script. An interesting fact is that unlike many other Indo-Aryan languages, Oriya has very little influence from Persian or Arabic. The language is thought to be decended from Magadhi Prakrit.
Dialects
Standard Oriya also know as Mughalbandi Oriya is what is used in litterary works and is spoken in some districts in Odisha. It is the kind that is spoken in the capital city of Bhubaneswar. I think this the most common type or Oriya.
Baleswari Oriya is spoken in baleswar, bhadrak and Mayurbhanj districts of Odisha.
Midnapori Oriya is spoken in the Midnapore District of West Bengal.
Singhbhumi Oriya is spoken in East Singhbhum, West Singhbhum and Saraikela-Kharsawan district of Jharkhand.
Ganjami Oriya is spoken in Ganjam and Gajapati districts of Odisha and Srikakulam district of Andhra Pradesh.
Desiya Oriya is spoken in Koraput, Rayagada, Nowrangpur and Malkangiri Districts of Odisha and in the hilly regions of Vishakhapatnam, Vizianagaram District of Andhra Pradesh.
There are other dialects of Oriya as well, but these are the biggest ones.
Oriya Grammar
Oriya has three genders, and almost has all the same cases as Sanskrit, however nominative and vocative merged as well as dative and accusative. There are only three tenses and other tenses are made with auxiliaries. Oriya has a very complicated morophology and morphemes system.
You can read on it here:
http://en.wikipedia.org/wiki/Oriya_morphology