A suggestion: why not offer a 'premium' version of wafflestats and charge for it? I would pay for these features (and I bet others would 'donate' for premium as well):
- 1min granular stats
- server-side data retreival (no need to keep the page open client-side)
- BTC/MH/24hr stat at every payment
- retain display settings for btc address
- separate graph lines for multiple workers (when poolwaffle implements multiple workers)