There's an app called SF Climates that shows microclimate data for SF. Quite useful as there can be a 30 degree difference between neighborhoods! (I have screenshots to confirm.)
Other than that, generally staying abreast of the latest startups that are offering promotions with VC money is a good idea.
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[ 2.4 ms ] story [ 42.1 ms ] threadStepWriteUp provides Waze-like pedestrian alerts for where there's human waste on your route
Chopp.ly offers real-time competitive bids on used bike parts
I'm sure I'm forgetting a few
Other than that, generally staying abreast of the latest startups that are offering promotions with VC money is a good idea.
http://sfpl.org/?pg=2000005001