Enjoy some of the quick reference cards which I frequent.
Coding in C --
C_Card.pdf
,
C_Card.ps
GNU Debugger (gdb) --
GDB_Card.pdf
,
GDB_Card.ps
Cascading Style Sheets (css) --
CSS_Card.pdf
,
CSS_Card.ps
Concurrent Versions System (cvs) --
CVS_Card.pdf
,
CVS_Card.ps
Standard Template Library (stl) --
STL_Card.pdf
,
STL_Card.ps
Plain TeX --
TEX_Card.pdf
,
TEX_Card.ps
UPS (Unix Product Service, a package manager from FNAL) --
UPS_Card.pdf
,
UPS_Card.ps
Here are some of the sources I've used to find these cards.
refcards.com
digilife.be