Category 1:
Plastic
Ceramic
Category 2:
Flip chip
lead carrier
Category 3:
Quad
DIL
Outline
Category 4:
SOP ....
TSSOP
QSOP
TQFP
PQFP
BGA
FTBGA
CGA
...
For more information check the website of the IC you are looking OR
if you are looking for specific information post it