I looked at my iPhone for some these:
Chase - Would love to check my account balance on the fly.
The Weather Channel - Apple Watch Weather is nice, but I want Radar Maps.
Runkeeper - I will see how Apples Fitness app is, but I have been using Runkeeper for a long time to track my walks and I love it. (anyone else think the voice sounds like Sandra Bullock? - Just Me?)
Dashlane - Any password management would be amazing on the wrist.
Google Maps - Although Apple Maps is getting much better Google Maps is still more accurate.
Flipboard - Use the Digital Crown to flip through your Flips and tap to preview, then hand off to your phone for full reading.
Pandora - Even if its just a remote feature for accessing the iPhone app, would be cool to control from the wrist.
Paypal - As a freelancer this would be very convenient.
Loose It -A Simple Calorie Tracker, use the digital crown to quickly input calorie intake per meal. Will give you your Basal Metabolic Rate and how many calories you have left for the day.
That is all I could think of right now that were not announced yet.