Very good idea. If i had my wish, i would put start up tips for new users at application open (or perhaps file open). But what would really make tips work is if the tips showed up when using certain functions. For example, the first time you use MIDI in/out, VSTs, macros/PCEs, etc., in much the same way MS WORD would offer to help when it thinks you're trying to create a letter.
Then as each tip was read, it would not show again, unless the user checked a box to remind him later.
Overall it's a good idea!