[support] Freetagging in Drupal 7 Taxonomies

Hi,

I'm adding blog functionality to a D7 site. I'm using Taxonomy to add a list of checkboxes for authors to tag posts. However, people will always want to add extra tags. Rather than force people to edit vocabularies, are there any contributed modules that allow for people to choose "other" and then add extra terms on the node form? I don't want to use the autocomplete widget as (based on current usage), I'll know we end up with a ton of similar/mispelled tags, plus I want to force people to reuse existing tags/limit the tags they use.

I'm aware of Hierarchical Select, but that seems overly complicated for this purpose (and I'm somewhat reluctant to use an Alpha release of a module with 143 open bugs on a live site).

Thanks,

David