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If you are looking to exlude feedapi nodes or webform nodes or maybe even node-types you ve created yourself using cck from your search results because they are not relevant.

Use http://drupal.org/project/search_block

Install and go to the settings page(settings > search > tab)
You ll be able to restrict nodes on a content type base from your search.

If your site was allready indexed you should re-index it. Go to settings > search to do it. Run your cron until everything is indexed.

This post will explain how to host multiple drupal sites using only one url on linux.
We have two sites a Dutch site and a French site and we want to host it under one url.
Setup your folders in de sites folders. Create a directory for the french site and create a directory for the dutch site. Both will have their own settings file.
In the root of your drupal installation create two symlinks. The two symlinks will point back to the root of your site.

In one of my posts I told about a technique to use multiple drupals in one database using prefixes http://dominiquedecooman.com/blog/how-run-multiple-drupal-installations-...

There is nothing wrong with this technique IF you start off with that setup.

But if you have multiple sites and you ve ALLREADY developed your sites using multiple databases and you want them REUNITED in one database. You should be aware of the following issue:
Drupal 5 uses the sequences table to keep track of autoincrement of node ids user ids, etc...

Apparently when your line length exceeds 998 characters an exclamtion mark is placed in your mail. This is exactly what happend to us when we tried sending a hmtl newsletter using simple news and mime mail module.
When using thunderbird you can see the source of your email. (with other clients probably too) You ll see the html part of the multipart mail is one line. Which offcourse exceeds the line length. Resulting in many Exclamation marks in your mail.
The Solution:
You ll have to chunk up your email before it reaches the mail() function.