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s2map is a simple geo visualizer <br/>
<a href="https://github.com/blackmad/s2map">source code on gitbhub</a>

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I find I have one or more lat/lngs, and I want to put them on a map and not worry about formatting, writing a file, etc, so I just paste it into s2map.com

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<a href="http://cl.ly/image/1n2o1p0Y2e0A">
example of pasting in a bounding box from some json
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<a href="http://s2map.com/#40.74,-74,40.75,-74.05">
using it via url params (doesn't support all the options yet)
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<a href="http://cl.ly/image/1s12263h0X3r">
rendering some geojson coordinates in lng/lat format
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I'm curious if other people find this useful or have feature suggestions.

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oh, and just for kicks alt/ctrl/meta+click pops up a balloon with lat/lng info

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Additionally, s2map demonstrates the power of google's s2 (spherical geometry library) available for <a href="http://code.google.com/p/s2-geometry-library/">C++</a> (which doesn't compile publicly, the version in <a href="https://github.com/blackmad/s2map">my github repo</a> does) and <a href="http://code.google.com/p/s2-geometry-library-java/">java</a> (in extensive use at <a href="http://foursquare.com">foursquare</a>). We use it as a very robust geohashing library with a number of great properties (skip-level indexing, prefix parents). Read the code, it's beautiful and well documented and a pretty good intro to the concepts. <a href="https://docs.google.com/presentation/d/1Hl4KapfAENAOf4gv-pSngKwvS_jwNVHRPZTTDzXXn6Q/view?pli=1#slide=id.i0">Presentaion</a> on the algorithms and features.

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<a href="/img/demo/default_covering.png">
Generating the default s2 covering for a bounding box
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<a href="/img/demo/100cells.png">
S2 covering with 100 cells
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<a href="/img/demo/polygon_covering.png">
Polygons work too!
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<a href="/img/demo/cells.png">
Visualizing some cell ids (tries to guess if you're visualizing cell ids or tokens)
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quick and dirty latlng visualizer

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