Ads are there to support the work developing on MyDays.
It does cost thousands of hours to create an application like this.
Also I know there are some User who would like no Ads at all.
Before you make a bad Comment in the Market just because of the ads, my following Advice:
- Purchase the Pro version, its just $4.90 and you also get extra features like password and notification
- AnyTime you can downgrade to the older Version from MyDays v0.90.
That Version provides less features and no advertising.
You can download/install it here: mydays09basic.apk
I appreciate should u like MyDays also with that small Ad and for sure even more should u purchase the app 
Enjoy Mydays.