Sometimes you might need to add more webparts to a certain page than the default MOSS limit, which is 50 webparts. If so in order to increase the limit follow the following procedure:
1. Go to the web.config file & open it.
2. Change the MaxZoneParts value to the new desired limit:
<WebPartLimits MaxZoneParts="50" PropertySize="1048576" />
3. Save it & go.