Changed shortlink zoom level correction char to '-', as this seems to fare better with twitter et al.'s URL highlighting. Decoder is backwards-compatible with the old system.

lib/short_link.rb

@@ -57,7 +57,7 @@ module ShortLink
     # append characters onto the end of the string to represent
     # partial zoom levels (characters themselves have a granularity
     # of 3 zoom levels).
-    ((z + 8) % 3).times { str << "=" }
+    ((z + 8) % 3).times { str << "-" }
     
     return str
   end

public/javascripts/site.js

@@ -231,7 +231,7 @@ function makeShortCode(lat, lon, zoom) {
 	str += char_array.charAt(digit);
     }
     for (var i = 0; i < ((zoom + 8) % 3); ++i) {
-	str += "=";
+	str += "-";
     }
     return str;
 }