During our work on various projects at CEDT, we came across many exotic electronic parts whose footprints were not already available in Eagle's libraries, so we created our own library and started adding parts to it.
CEDT's Eagle Library has now been made available on GitHub:
http://github.com/lithiumhead/CEDT-Eagle-Library
List of parts made available in the library (as of 20 May 2012):
60BVHX3
AT45DB041B-SC/SI/SU
TINY24/44/84P
TINY24/44/84S
BUTTERFLY
CDSLDR3MM
DS1302S
LM1_THR1_01
LM1575/2575TVERTICAL
LM1575/2575THORIZONTAL
MMA1250D/1260D/1270D
RGB_SMD_LED
SLIDESWITCHBIG
SLIDESWITCHSMALL
TPS61070
U2270B
XBEE
XBEEPRO
XC9572
LOGO-CEDT
A4FRAME
1N5819
16X2LCD
NOKIA6100_LCD
BOX10
POWER_CON
L664A
AAA
LM2940
PCF8563
DM12864A
LM3480-3.3
ATTINY13
2SD789
W04M
USBFINGERS
FYM-12881AXX
FYM-12881BXX
AT32UC3B0256
IRF7555
IRF7424
FDC658P
B5-P5S-0D-Z
TOBU3
40-XX
BATTERY-2
POT
MSP430G2231
M02
MCP1700
TPS852
LR44
LCD-NHD-0208AZ-3V3
ARDUINO_SHIELD
ARDUINO_FOOTPRINT
1.5X2BATTERY
10KPOT
DPDT
DS1302D
LED-TRICOLOR-COMMONANODE
LM35TO-92
MAX5820
MEGA8-P
NOKIA3310LCD
USD-SOCKET
EKKLM3S811
ATMEGA32U2
USDCARD
LCD-NHD-0208AZ-3V3-EAGLE_LIGHT
BOB_LM3S608_CIRCULAR
BOB_ARM_LQFP48_STM32F103XXX_CIRCULAR
BOB_ARM_LQFP48_STM32F103XXX_OVAL
BOB_LM3S608_OVAL
1X2_LR
HEATSINK
PRESET
TPA4861
TLV5636
10-XX
REG1117
CAP_POL
CAP
JTAG-20
AUDIOJACK3.5MM
18S20
LM3S3654
LM3S3826
LM3S608
THUMBPOT
BOB_LM3S3654_OVAL
BOB_LM3S3836_OVAL
BOB_SMALL_LM3S608
USB
LM358
FT232RL
MIC
CRYSTAL
RESISTOR
LED
PTC
DAC7571
Datasheets of few of these parts are available here:
http://docs.google.com/open?id=0B4p9WYbCzf8UZmdvdFFQNHBjMDg
NOTE:
Some of the "Packages" associated with a few "Devices" in the CEDT Eagle Library have been imported from existing libraries supplied with Eagle.