EDITED on 11/22/06

Ok so if there's anyone else out there like me that is trying to make their vanilla forum into a website/forum combo and in doing so has to make a lot of custom pages that the extensions need to be applied to then you should read this quick fix. I have a few extensions on my sidepanel that I have to manually add to the list of pages that can load it in the default.php file for each extension. This can be very tedious and annoying if you have 50+ custom pages like me. So I decided I better find a way to fix this so I don't have to do all this extra work. Thanks to Minisweeper for giving me the solution after I botched an attempt to fix it on my own lol. Here's the instructions:

ok in your default.php file you should see a block of code that looks like this:
if(in_array($Context->SelfUrl, array("index.php", "categories.php", "discussions.php", "comments.php", "search.php", "post.php", "account.php", "settings.php"))) {

replace that block of code and there with this
if ($Context->SelfUrl != 'people.php') {

and that's it! See how easy was that? Now you don't have to worry about adding new custom pages to a list it automatically shows the extensions on your custom page. Enjoy ^.^

I've used this thread as a jump-off for a bigger picture discussion on add-on management within Vanilla, comments welcome:
http://lussumo.com/community/discussion/4400/addon-management-tools/

The if statement merely limits the pages the add-on can 'attach' itself to, so I guess by default it attaches to all pages.

You could just use a negative if statement...
if ($Context->Selfurl != 'people.php') {

hmm I got this error when I tried replacing the if statement with if ($Context->Selfurl != 'people.php') {

Notice: Undefined property: Selfurl in /mounted-storage/home4/sub002/sc11923-BRUP/oga/Vanilla.1.0.1/extensions/SidePanelImproved/default.php on line 40
Fatal error: Call to a member function on a non-object in /mounted-storage/home4/sub002/sc11923-BRUP/oga/Vanilla.1.0.1/extensions/SidePanelImproved/default.php on line 43

omg that was it? lol

Awsome that worked! Thanks a lot :) I'll update the original post at the top to have the correct way of doing this.