For Drupal, Quicktabs is a useful module that provides helpful user navigation aids for a site. Used properly, it can be of great assistance to users navigating your site.

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This is a presentation done on November 2nd, 2009 for the Kitchener Waterloo Linux Users Group on Linux toolbox for monitoring and performance.
Many tools are discussed, including: top, htop, atop, vmstat, netstat, ntop, vnstat, iostat, strace, systemtap, oprofile, apachetop, MySQL processlist, Munin, Awstats, and Google Analytics.

We have posted before on how to display previous/next thumbnails for image nodes. We also have a module that is basically a Previous/Next API for high volume / high performance sites.
But sometimes you need a simpler solution for regular nodes, just using the node title and a link to it. This article explains how to achieve that for Drupal 6 in one simple function and a few changes to one .tpl.php file.
First, we start off with the code that does the heavy lifting.
In your theme's template.php add the first function from the attached file.

A very large site we manage for a client was upgraded recently from the memcache module version 1.12 to version 1.13.
However, the result was less performance for this server that was humming alone happily with the older version.
The Munin graphs tell it all: look at the change at 12:00 noon.
Here is the CPU graph, showing double the CPU utilization on this sever.

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