The getTags method that belongs to the store object is used to return a list of all the tags used in your tiddlywiki and the number of times each is used.
It takes one optional parameter, an array of all the tags you wish to exclude from the returned results.

You can use it without excluding some tags like so:
store.getTags();
This will return something like this:
[["command", 1], ["concept", 3], ["Developer Tools", 5], ["excludeLists", 74], ["excludeMissing", 7], ["excludePublisher", 1], ["excludeSearch", 72], ["global", 3], ["method", 17], ["store", 4], ["story", 4], ["systemConfig", 39], ["tiddler", 3], ["tiddlywiki api", 1]]

To filter out certain tags use it like this:
store.getTags(["excludeLists", "excludeSearch", "excludePublisher", "excludeMissing", "systemConfig"]);
This will return something like this:
[["command", 1], ["concept", 3], ["Developer Tools", 5], ["global", 3], ["method", 17], ["store", 4], ["story", 4], ["tiddler", 3], ["tiddlywiki api", 1]]
bag
tiddlywikidev_public
created
Fri, 17 Dec 2010 14:20:25 GMT
creator
colmbritton
modified
Mon, 24 Jan 2011 13:40:12 GMT
modifier
colmbritton
tags
method
store
theme
TWDocTheme