Similar to the G2 module a module to add a alphabetical list of tags to the sidebar.
Create a block to show the tags with weighting via a bar graph.
Tag quantity/weight is dynamically controlled with CSS.
This module may be downloaded from the Codex here.
To install, extract the "tag_graph" folder from the zip file into your Gallery 3 modules folder.
Afterwards log into your Gallery web site as an administrator and activate the module in the Admin -> Modules menu.
Configure the module: Appearance -> Tag graph. You will be able to make various changes to the appearance of the block in the sidebar. Save
Order of sidebar items can be changed via the sidebar appearance page.