What a great idea, create Mac apps to fill gaps - even if I personally 
never actually came across any, not since 1986. For example, it seems 
there exists a market niche for Macintosh accounting packages in the US. 
FYI  us furriners are already pretty well-served with several excellent 
Mac accounting packages, ranging from industrial-grade  heavyweights to 
zippy no-frills book-keeping apps like MYOB, CashWorks and Quicken. So, 
before investing any time and ingenuity on re-inventing the wheel, why 
not sniff beyond the length of Uncle Sam's nose to check out the 
potential competition out here? Just my ha'pennorth :-)

Aller Spanninga
New Plymouth
New Zealand