I have a great appreciation for wordpress plugin developers. Having released a few simple plugins myself, I understand the time it takes to develop and test a quality plugin. On top of that, devoting time to support the plugin and keep it up-to-date as wordpress rapidly evolves is another effort in itself.
This is especially important on our cake blog. Using search meter, we’ve found that many people are searching for cakes using common misspellings. And while we’ve developed a plugin to correct common mispellings, this tactic doesn’t scale well as it requires us to hardcode common misspellings.
Joost’s plugin allows us to cover a wider array of mispellings. A good addition to this plugin would be a feature to allow wordpress admins the ability to add overrides for commonly misspelled words. This would be useful because the Yahoo API doesn’t work as well for word combinations. For example, the API will catch the misspelling for Haloween, but does not catch misspelling for “Haloween Cake“.
I suggest wordpress admins check out Joost’s complete lists of plugins.