1) Is there a way to offer just a numeric keypad? Changing the zip code can be a pain.(I've been using it to check out the cam across the country!!) Maybe use an entry screen like the LED time/temp screensaver. It also stores 5 zip codes.
I agree that the full keyboard is a little overkill for the ZIP. However, I think I should point out that limiting to digits only, also limits the usage to USA only. For example, I've sometimes wanted weather from places in Canada, and Canada uses both numbers and letters in their postal/zip codes.
2) Maybe add a timestamp for the last time the data on the main screen was updated ?
I was thinking the same thing as well. Or better yet, make it a configurable option, so those who want it can have it, and those who don't want it can avoid seeing it.
And as long as we are making suggestions for nowhereman, two other pieces of data that I would find useful (to have included) are:
1) The current barometric pressure (and if it is rising, falling, or steady).
2) The current (local time) Sunrise and Sunset times (for today).