IBM introduced Mail Rules in Lotus Notes 5.x. While this feature was working quite well an enhancement of these rules in ND6 causes some troubles. IBM asks his customers running Notes 6.5.0 and 6.5.1 to update the mailtemplates. See this Technote for details.

Higs pointed me to a free RSS reader called BlogExpress which is available at http://www.UsableLabs.com/productBlogExpress.html although this product does not work with a HTTP proxy yet.
I was using Feedreader from http://www.feedreader.com before but this one has a very basic user interface. On the other hand it supports a proxy and has an internal webserver so you can use it to build your own web news aggregator.

... was that it is not as easy as it sounds first. While formating elements using inline CSS is quite easy, using nested CSS classes is quite complicate. Finding that some browsers have implementation bugs or different understanding of a standard makes things even more tricky.
I found that Opera browser and mozilla seem to have a good implementation while IE has some caveats.

Overall CSS has everything it needs to build a complex page without the need to use any tables! This means that the page is displayed correct on different screen resolutions!
If you want to make a deep dive into Cascaded Style Sheets by your own you may want to read this book:

I intested all day and night to understand how this CSS stuff works in BlogSPHERE. I ignored most of the possibilities of CSS and so most CSS related stuff is not really tested in the current release. This has to change! I made some essential changes in the database and gave the website a new fresh design. But have a look at yourself:
http://www.brandlehner.at/Brandlehner/c2picture.nsf
If you like this or if you have any suggestions please let me know.

IBM introduced Streaming Replication with Lotus ND6. If a Lotus Notes Version 6 Client connects to a ND6 server for replication, this new replication process should speed up the replication.

Below is a list of the new Notes.ini parameters included in the Notes/Domino 6.5.1 release.