Broad covering of the subject, more further links:
Newsgroup: rec.gambling.lottery
e.g. through:
http://groups.google.com/groups?hl=en&q=rec.gambling.lottery
Lottery Director
http://www.ldir.com
Lottery Information Directory
http://www.lots0cash.com
Lotto Designs (go here for math)
http://lottodesigns.50megs.com
Lotto-Logix Lottery Resources
http://www.lotto-logix.com
LottoMasta
http://www.lottomasta.com
Lotto Tutor
http://www.lottotutor.com
The Lotto Site
Web based wheeling generator for all lotto games. Includes drawings, statistics and printing for most popular games.
http://thelottosite.com
Large collections of currently available wheels:
Peter's Lotto-Wheels Page
http://www.algonet.se/~peteros/
La Jolla Covering Repository (m=t wheels)
http://www.ccrwest.org/cover.html
Mladen Malik's Pick-7 Wheels
http://www1.50megs.com/mladenmalik/wheels7.html
World records reference:
Covering Repository of Rade Belic
http://www.xs4all.nl/~rbelic/mainpage.htm
Lotto Wheels of Dragan Stojiljkovic (get the C(49,6,3,6)=163 record wheel)
http://www.geocities.com/dragans2000/
Another approach to wheel optimization:
Lotto Designer
http://lottodesigner.5u.com