I don't know if anyone here uses an electronic lab notebook (I'd be interested to hear if you do), but for the last couple of years I've been using a simple weblog-style notebook based on Wordpress.
Now, so that I had something to recommend to people who were interested in keeping an electronic log of their experiments, and to get feedback on the kind of tools people would like to be able to use, I've released NotePress: a package of Wordpress (slightly modified), a custom theme and some useful plugins.
It's free, open source and all that, and pretty obviously doesn't include the kind of electronic signature verification or data management tools that the big expensive commercial notebook packages do, but it's been good enough as a searchable archive of experiments.
If you're interested, use Subversion (recommended for easy updates) or download a recent release and give it a try.
Comments
Review of ELNS
I wrote a review in Nature recently of open source and commercial electronic lab notebooks: see Electronic notebooks: A new leaf
All the bookmarks I collected during research for the article are publicly shared on Connotea under tag
'ELNS'
Neil Smalheiser wrote to me last week to let me know that he has made public for download the open source notebook Wetlab.
Hope this information is helpful
Declan