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Here's a small bit of knowledge from the Drupal.org forums that'll be news to no experienced user, but is very important for newcomer admins or any user given power to delete content on a site:

If you delete a node (Page, Story, anything) on a Drupal site and decide you want it back, is there an undo feature? No. You get one chance to back down when Drupal asks "Are you sure you want to delete [node title]?", but that's it; click 'Delete' again and it's gone, man. There's no Trash Can or Undo option or other means of retrieval. Your only possible recourses are:

1. Restore the node from a database backup. (You should of course have such a thing.)

2. Look for a cached copy of the node on Google or some other web site caching service. You'll have to rebuild the node from scratch and re-input all of its fields, but at least you may be able to recover the node's main body text from the cache. (Who knows; you may even have a cached version of the page within your own browser's cache.)

Fortunately, it's easy to avoid data-wiping accidents. Make sure all users know that there's no easy undo for a deletion. (Alternately, don't give users permission to delete nodes in the first place!) When you do want to take a node off the site, consider hitting that node with a simple unpublish instead of a delete. It'll disappear from sight (and site), but will nicely lie dormant until you should choose to resurrect it. 

Here's a good bit of info on Drupal login session length spotted in the Drupal.org forums:

Tired of logging in again and again to a Drupal site that keeps kicking you out? You can modify session length, i.e. the length of time that a logged-in session stays logged in. Open the site's settings.php file, and look for this line:

ini_set('session.cookie_lifetime',  0);

Replace that "0", or whatever number is there, with the number of seconds for desired session lifetime. The system will probably limit you to a max 2000000000 (two billion) seconds – which, at over 60 years, is extreme overkill. (Rule of thumb: One million seconds = 11 and a half days. Or just figure 100K seconds as a day plus change.)

Keep in mind, though, that letting users stay logged in for a long time has security implications (such as when a logged-in user's computer is appropriated by someone who shouldn't be poking around in the site). For more details and an alternate, module-based approach to setting session length, see the Persistent Login module.