update 6/29/09 the email install method no longer works, see here:
http://forums.precentral.net/showthr...57#post1718457
See this thread for instructions for how to install homebrew apps:
http://forums.precentral.net/homebre...r-1-0-4-a.html
---
Welcome to the Homebrew Apps Section of PreCentral.net! There are a few things you need to know before you get going:
1. All apps are provided AS IS and PreCentral.net does not warrant that they will work, work properly, or hurt your device. PreCentral.net is not responsible for anything that happens to your Pre as a result of the software you download here.
2. Only a developer may create a new thread - one thread per app please.
If you're interested in getting permission to create threads/ post apps, simply contact us on our form and select "Developer Access" - http://www.precentral.net/contact. Be sure to include your username in your message . Please don't send in a request unless you have an app to post, though! You don't need to ask for Dev Access to get the apps here, "Dev access" is simply to allow people to create new threads and post apps.
3. Devs, please append [NRR] (stands for no rooting required) or [Rooting Required] in the subject line of your thread and include as much information as possible in the first post, including updates, installation instructions, etc. We also want to keep a 1 app : 1 thread ratio. You also
must attach your app to the first post in the thread.
4. ***UPDATED 7/17/09*** If you have a version change, please edit your original post with the newest details (keep your old .ipk if possible for archiving purposes). Darth Pooh will try to update your title as quickly as possible, sometimes he might miss it due to rapid changes. You can notify him by PM of these changes OR use the
Report Post 
link on the thread and make comments regarding a new updated version and it will be taken care of ASAP.
To install an app, you must be logged in. Click "Email attachment" and a link to the app will be emailed to the email address on file. Then simply tap the link to install on your Pre. Orange + Tap should delete the app, but your mileage may vary.
If you need to change your email or password, go to
http://www.precentral.net/user , log in, and click the edit tab.
Other questions? Post 'em here.