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We use little Hobo data loggers. They are lightweight, They last a year on one battery, they can survive cold temperatures, moisture and are pretty rugged.  At this stage we use only an internal/external temperature Hobo ($75).

There are all sorts of data loggers.  Hobo makes 8 & 12 bit data loggers as well as serial or USB loggers.   There is also quite a variety of measurement options to choose from.

Pros

Uses easy to use software to set data loggers measurement frequency, set active channels, and delayed start.

Tough and lightweight

Software allows for instant field download of data into PC (creates graphs and numerical data)

With internal and external temperature channels active it will log several hours of data taking measurements every 3 sec.

Cons

All sensors, cables, and software costs extra.

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We also datalog our GPS onboard using a Sparkfun Logomatic board ($60). This board uses a SD memory card (16 MB can hold weeks of data). Small and lightweight, perfect for ballooning. You will need to use a Max232 chipset (a.k.a level shifter kit) to convert the GPS voltages to TTL levels.