Leibniz biography by Eric Weisstein - bias on natural philosophy, lots of hyperlinks!
A larger biography from Mathematical McTutor
A Chronology of Leibniz's life - from Dolphin logic
Donald Rutherford's chronology of Leibniz's life
W. W. Rouse Ball's Biography - mathematics in forefront
Biography of Leibniz - by George MacDonald Ross
A Short Biography of Leibniz - by myself
Timeline of Leibniz's life - as above, but larger - I wouldn't trust the bibliography, however...
Another, shorter biography in German from Leibniz-Archiv
An introduction to Leibniz from Books and Writers Calender
Biography in English from NNDB
Short biography in German
Ross, George MacDonald: Leibniz and Sophie Charlotte
The Monastery of Loccum - the HQ of the Church union
Neustädter Hof- und Stadtkirche St. Johannis in Hannover - the church where Leibniz is buried
Peter the Great's Decree Appointing Leibniz to the Russian Justizrat - transcription by Justin Smith
Classic biography by Guhrauer, vol. 1
Classic biography by Guhrauer, vol. 2
Brandon C. Look: Leibniz - From Stanford Encyclopedia of Philosophy

Virtual exhibition of Leibniz (> Leibniz Virtuell) - from LeibnizCentral

From Gregory Brown's Leibnitiana:

Leibniz's house in Hannover
Leibniz's Family
Leibniz's Chair
Chart of Leibniz and the royalty (.pdf)
The House of Brunswick
Leibniz's tombstone
Leibniz's skull

Hannover in Leibniz's time and nowadays (> Virtueller Stadtplan) - from LeibnizCentral
Leibniz's calculation machine (> Die Reschenmaschine)  from LeibnizCentral, complete with 3D-model and videos