All users of Adobe’s Lightroom software need to read Jeff Friedl’s post about JPEG settings in the application. In a nutshell, his own experiments with the quality “slider” reveal that its 0-100 range really amounts to 13 actual outputs, which may or may not match Photoshop’s same number of outputs when saving for the web. More importantly, he noticed that if you save a file as compressed, you do not really gain anything in terms of visual quality if you save above “75” on the slider. Files get bigger, but images do not get (noticeably) better. Great results from a great guy.
(For the record, I use, and paid for, his Flickr plug-in which allows me to upload directly to my Flickr Pro account from Lightroom. As I consider using Zenfolio, I will also likely use his Zenfolio plug-in.)