Note that there is a bug in Lightroom 3.0 concerning the choice of watermarks: choosing "Simple Copyright Watermark" results in no watermarking. This bug is fixed in version 3.2 of Lightroom, but the best is to set your own style.
Also note that, as of version 1.3 of this plug-in, it requires Lightroom version 3 or later. It will not work with Lightroom version 2.x.
This also widens the audience of your web gallery: visitors using Internet Explorer 6 will see the web gallery rendered the same way as in Internet Explorer 7.