I don't think there is a plugin. I wrote an addition to the quicktags to display some pretty complex tables for a client who has a bridge blog and some investment blogs.
Here's the "simplest" table one:
edButtons[edButtons.length] =
new edButton('ed_table'
,'Table'
,'<strong>*</strong>nn<table class="table" cellspacing="2" cellpadding="7">n<tr>n<td class="td1">*</td>n<td class="td2">*</td>n<td class="td3">*</td>n</tr>n<tr>n<td class="td1">*</td>n<td class="td2">*</td>n<td class="td3">*</td>n</tr>n<tr>n<td class="td1">*</td>n<td class="td2">*</td>n<td class="td3">*</td>n</tr>n<tr>n<td class="td1">*</td>n<td class="td2">*</td>n<td class="td3">*</td>n</tr>n</table>nn'
,''
);
This is a fairly simple table with areas for text entry noted by *. It should work if you simply plug it in just like that in quicktags.js. You can style it through the style.css of course. And you should be able to extrapolate from how that one's laid out, how to change to the sort of tabular display you need.