Here is a good article on the Clearflight Pied Mutation: Wikepedia
Here is a well written explanation of sex-linked genetics, with Punnet squares and illustrations. It is written about the opaline gene in Bourke's parakeets, but it applies to the opaline gene in any parrot species, as well as to any sex-linked gene in any bird species. The Splendid Bourke Bird Blog
Click on the following link to explore a fun, world wide forum of budgie breeders, discussing every possible aspect of life with budgies (a.k.a. parakeets)
Click on the following links to find other bird resources.
Reed Seed Company (Southern Ohio Bird Fair) Reed Seed holds a bird fair in Greenwood every March, at the Knights of Columbus Hall on Pushville Rd. This is a great place to find cages and accessories for your budgie. It's also a good place to look for a new bird, if I don't happen to have any available for sale.
Central Indiana Caged Bird Club CICBC holds three bird fairs a year, in May, August and November. The May and August fairs are held at the Marion County Fairgrounds in Indianapolis, and the November fair is held at the Knights of Columbus Hall on Pushville Rd, in Greenwood. They are held on Sundays, from 10am to 4pm. Dates vary by year, so check with CICBC for the current year's show dates.
Other fun things:
My sister is a jewelry design artist. Here is a link to her blog, where she describes how she makes her designs: