Felix,
Not trying to rush you or commit you to anything for a future product; but what are your current thoughts regarding sensors if you ever put out a temperature/weather shield?
There are a few posts talking about DS 1-wire sensors, and
at least one where you said you're a fan of the TMP36. I'm not opposed to spending some time and effort putting together my own shields for monitoring environmental conditions, I'd just rather any effort I spend to line up with the direction you think you'll go if you ever put out an item I'll be able to order pre-assembled down the road.
So this isn't another "quiz Felix to see why he hasn't give me a pony yet" posts, here are my limited observations based on the sensors I've played with. Some sensors are either humidity or barometric pressure in addition to temperature:
DS18x20 - Reasonable price. Nice resolution and accuracy, but like you've pointed out it isn't very friendly for battery operated devices. Unique serial number is a bonus.
DHT11 - Cheap, but it has crap resolution and accuracy and takes up a pin per sensor.
DHT22 - More expensive brother of the DHT11, Acceptable resolution and accuracy, still needs a pin per sensor.
TMP102 - Cheap. i2c but only has a couple of address options. Very nice accuracy & res, but comes in one of the smallest SMT packages I've ever seen so a breakout board is a must for prototyping.
MPL115A2 & BMP085 - Both of these are reasonably priced and provide decent temperature in addition to pressure. i2c, though the cost per sensor makes having multiple on a single uC unreasonable for just measuring temperature. Good candidates for outdoor weather sensors.
Also a page somewhere that has a list of all of the pins you're using across all of your projects would be awesome. I think I picked a good one to use with a DHT22 in D17/A3, but wasn't sure if you've got plans for it on an unreleased project.
(edit: Make title a statement not a question.)