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) This is the company where I get my seed. They bring it to the bird fairs and you can pre order how much you think you will want. They sell 50 pound bags, but also smaller plastic bag sizes. I like their Finch Mix for my budgies, and their Canary Mix for my other types of birds.
Central Indiana Caged Bird Club CICBC holds four bird fairs a year, in February, May, August and November. The May and August fairs are held at the Marion County Fairgrounds in Indianapolis, and the November and February fairs are held at the Hancock County Fairgrounds in Greenfield. They are held on Sundays, from 10am to 4pm. Admission is $4.00. 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: