Here is the technique I used in order to be able to connect my MacBook Pro to the Internet through my t-mobile Treo 680’s internet access. Please note: You need full internet access from t-mobile, not just the $5.95/month e-mail and WAP package they sell.

This worked for me, but I make no guarantee that this [...]

AppleJack 1.3.2 fixes a serious bug associated with File Vault use that could wipe large sections of a user’s hard drive. In addition, AppleJack has been retooled to operate much more securely while doing file deletions. An added feature in this release is an automatic check for the /tmp directory (often implicated in boot problems). [...]

AppleJack is a user friendly troubleshooting assistant for Mac OS X. AppleJack lets you troubleshoot a computer even when you can’t load the GUI, or don’t have a startup CD handy. AppleJack runs in Single User Mode and is menu-based for ease of use.

I have written a Perl script that simply checks to see how long it’s been since a particular task has been performed, compares the time with how often that task should be performed, and if necessary, executes the task. The script is extensible to any maintenance tasks that output to a log file (and any task can be made to do so). The script also includes the option to send you an e-mail (but only if the task(s) have been executed) including full script output. Also, there is an AppleScript controller which will allow you to suspend maintenance activities for discreet periods of time, so you’re machine won’t suddenly start churning during a presentation, for example.

Regardless of the ‘Switch’ ads’ sanguine approach to entering the promised land of Mac OS X, there are some areas in which Mac use can be somewhat frustrating. One of these areas is financial software. Every year, at tax time, I am left wondering what features are going to be left out of the Mac [...]

I have written a Perl script that simply checks to see how long it’s been since a particular task has been performed, compares the time with how often that task should be performed, and if necessary, executes the task. The script is extensible to any maintenance tasks that output to a log file (and any task can be made to do so). The script also includes the option to send you an e-mail (but only if the task(s) have been executed) including full script output.

The origin of these instructions are the quite detailed notes
Bernard Saar contributed to the Macintosh support forums <http://discussions.info.apple.com/WebX?13@@.efc404a/13>.
My intentions in creating this page is to simply flesh out in more detailed,
step-by-step fashion, the wealth of information he and others have kindly provided.