A 28 pin 8 bit microcontroller in a DIP package as used on the Sumovore Atmel Brainboard add-on.
The 74HC595 is very useful in expanding how many pins a microcontroller can write to. Use 3 to write to 8!
What's a 74HC165N do? Think of it as the reverse of the venerable 75HC595 - it's 8 bits in, serial out!
The uM-FPU V3.1 math coprocessor is a full featured standalone math engine that is capable of crunching even the toughest of mathematical equations.
The uM-FPU v3.1 is a floating point math coprocessor for your microcontroller. Send the data via SPI or I2C, and get an accurate result back without loading down your main micro!
The 24LC128 is a128K Bits x 8 I2C serial EEPROM device.
The 24LC16B is a16K Bits x 8 I2C serial EEPROM device.
Handy for extending the "brain space" of any microcontroller!