Is there a way to improve computer performance during TM backup?

I have a MacBook Pro 2.4GHz Intel Core 2 Duo with 2GB of RAM running 10.5.7 and every time Time Machine starts a backup (about once an hour) my computer becomes unresponsive. I can't type, copy, paste, switch applications without a huge hang up. For example, it took me a total of 7 minutes to get to this thread because Time Machine started a backup and I was stuck in the Finder trying to switch to Safari. Once Safari finally showed up, I got a beach ball.
When TM isn't running, my computer is restored to a responsive state.
I love using Time Machine, because it's a great way to backup everything. Short of turning it off, is there anything else I can do to prevent my computer from going in to lockdown once an hour?
I'm backing up wirelessly to a MyBook USB drive btw.

Just an update to those who may stumble across this thread.
This issue has not been solved. In fact, I could say it's gotten much much worse. It seems that I can't type, copy/paste or perform even the most basic of tasks while a backup is in progress.
I've downloaded the Time Machine Backup Widget, and it shows a few oddities that may/may not be significant. On one particular day the log shows a request for 1.3GB and then for the next backup (1 hour later) a request for another 2GB in size. Each of the hourly backups seemed to be of similar size requests for that day. What's unusual is that for that particular day, I wasn't really working on anything of significant size at all. I'm a web developer, so I may modify a 1MB file throughout the day, for several hours, but I'm no where near generating modifications that would equate to 8GB a day. My first thought was that Time Machine might be swapping out a weekly/monthly backup at that time - but then the same requests seem to be coming the following three days. Does it take Time Machine that long to perform a weekly backup?
At Time Machine's current rate, my hard drive is filling up pretty fast. To the tune of 8GB a day. The logs seem to also indicate that Time Machine is only copying 2.1MB a day. Again, that falls in line with what I would expect with my activity, but the hard drive seems to be dedicating the "requested" rather than the (smaller) copied amount indicated in the log files.
Backup frequency also seems to be higher than normal on some days. Today, for example, Time Machine has been backing up about once every 20 minutes or so. Right now, I'm on a backup, at various times my typing has been affected and according to the backup status it has been backing up 2.4MB of 2.5MB for the past 22 minutes. It just barely finishes and then it starts right back up again.
I've kept Activity monitor running for the past couple of weeks and as suspected, my CPU reaches maximum capacity and my disk activity goes through the roof during a backup. My external wireless mouse and anything connected to my computer seems to become unresponsive. The trackpad and keyboard go next. Then - typically - I see the beach ball and I know I'm up for an unscheduled computer break. This is most annoying when I'm trying to type an email and a backup kicks in just before I have a chance to click send. One time it took me 10 minutes for my click to be recognized and an email could be queued to send. It took another 3 full minutes for the email to actually go out.
For me, backups are essential. I have resisted turning this feature off, simply because I spent so much money to get it all to work (upgraded OS, purchased a new router and a new backup HD).
I hope Apple releases more control over the backup features and the backup frequency. I'd love to see an option to have backups happen only when CPU cycles are at idle for a few minutes, which would indicate that the user isn't on the computer. Or perhaps give users the ability to set a less aggressive backup schedule, perhaps every four hours or so, rather than the aggressive hourly backups I'm stuck with now.
Time Machine's current status: "finishing backup." has been it's status for at least 10 minutes, that combined with the outlandish 45 minute time it took to copy 2.5MB of data means I have just 5 minutes before my next backup is scheduled to start. There has to be a better way.

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