...custom error templates.
I think I said something similar elsewhere but it would be *great* in all your modules if you could declare custom error templates.
Something like:
{exp:user:edit error_template="/error"}
{/exp:user:edit}
And then on that /error page, something like the ?:
{if error}
{exp:errorlist style="nested"}
{error}<br/>
{/exp:errorlist}
{/if}
This would allow for AJAX goodness in, potentially, *all* your modules.
/thinks out loud
haha 
