cbsmth

tinyFeedback help you collect feedback in a manner that in unobtrusive and flexible for your visitors, while still having many powerful, configurable features.
When activated on your website, a tab is inserted with a short message and two options, positive and negative. When the user selects either option, the counter value for the corresponding page is increased. If the negative option is selected, a lightbox form appears querying the visitor for more information.
Optionally, a cookie can be set so that the visitor will not see the same request again after leaving feedback.
All texts displayed can be configured through the administration panel, and there are several visual appearances (styles) to choose from.
In addition to the above, tinyFeedback offers functionality to bind the activity to Google Analytics event tracking, and filter the form input through Akismet to avoid spam. For the advanced user, the CSS- and jQuery-injection can be disabled and performed manually instead, for optimization purposes.
For more information and a live demonstration, please visit the <a href="http://cbsmth.se/web-development/tinyfeedback-wordpress-plugin/" rel="nofollow ugc">plugin homepage</a>.

tinyFeedback

A minimalistic yet highly configurable feedback plugin. Options to intergrate with Google Analytics and Akismet available.

xhtmlweaver

This plugin can greatly improve the user experience for your blog, by automatically and periodically saving the “just typed comment” for your visitors (the content textarea input box in comment section). The just typed comment is saved into browser’s local storage system to prevent loss of any unsubmitted comment from your visitors and doesn’t require any backend support.
This is similar like WordPress can remember your Name, Email, Website in comment area for the next visit, but WP Local Storage plugin extends this into next level, it can remember the actual unsaved comment (i.e. before hit submit button) so even the browser is crashed before the user hit save, it is okay! When the user came back, all “just type comment” will be still in there.
Full Support is available at http://www.xhtmlweaver.com or wp-support@xhtmlweaver.com

WP Local Storage

This plugin automatically and periodically saves the "just typed comment" for visitors so no data will be lost even the browser crashed.

tinyFeedback vs WP Local Storage