Livius.org: The Hasmonaeans by Jona Lendering. Excellent scholarly summary mostly on Judas' successors.
Hasmonean family tree (click to get short summaries) from Mahlon H. Smith's Into His Own: Perspective on the World of Jesus (Rutgers University). Smith has also compiled a similar clickable Seleucid family tree.
Catholic Encyclopedia: The Machabees entry by F. Bechtel (1910 edition). Detailed entry.
Columbia Encyclopedia: Maccabees. Covers the wholy dynasty briefly.
FTP Text File: Review of Joseph Sievers, The Hasmoneans and Their Supporters. From Mattathias to the Death of John Hyrcanus I. Reviewed by A. Pietersma, Ioudaios (September 1992)
Jewish Encyclopedia: Antiochus IV Epiphanes. An excellent, scholarly entry in the 1901-1906 Jewish Encyclopedia. Entry by Louis Ginzberg.
Wikipedia: Antiochus IV Epiphanes, based on Easton's Bible Dictionary (1897). Usual Wikipedia caveats apply.
"Antiochus IV Epiphanes in Jerusalem" by Daniel R. Schwartz (Hebrew University). Scholarly article attempts to resolve inconsistencies between 1 Macc. and 2 Macc. on the date of Antiochus' pillaging of the temple.
"Who Wants to be a Maccabee? Hanukkah Quiz" by Lisa Katz, About.com's Judaism guide. Apart from the speed—about.com really bugs me—this is a good, solid quiz, with little follow-up explanations after each answer.
Other historical topics
Wikipedia: Chanukah. Good introduction to the history and the modern upsurge in the holiday.
Livius.org: Ancient Anti-Semitism by Jona Lendering. Scholarly summary, including as section on Antiochus, Judas Maccabeus and his successors.
Jona Lendering's history of the term Messiah. The link is to part six which deal a surge in messianic expectations during the Maccabean period.
"Judaism and Hellenism: The Encounter" by Clare Goldfarb. Undergraduate paper?