Using a daytimer is an excellent tool for tracking progress. One easy method is to set up a 'Legend' , use a rate scale #1-5 or Yes/No or whatever resonates with you.
Then on the end of each day, rate your progress easily - the easier it is the more likely you will continue.
My Grid:
I draw a sun /cloud/ and include temp.
Family - was I good to my family today, did I do something extra special? (-5 to +5)
Work - am I on target with my goals, did I 'do my best'? (-5 to +5)
Physical - Was I 'on my game' Weak, Strong. Depressed, Happy, Moody and -1 to +5)
Exercise - Yes/No
This is what it looks like:
Cloudy, rain -2 // F+1 // W-4 // P HHHH !!! +5 /// E - YES!! Walk with PN on MP3
I keep my journals, and monthly add scores to see how I am doing, look at temp. cloudy days etc. to see how my mood was, and can now go back 3 years since I first started this, and do comparisons to see patterns, growth etc.

Be IMPECCABLE with your committments.... this made me laugh out loud today! I signed up for the 50 days, with the belief (and I guiltily admit I rationalized outloud to a friend {whose opinion of me I am dependent on ... lol) why I was doing this.) .. that if I am too busy after a few days... I can just quit..... it's not like it is a REAL committment or anything...... thanks Brian for another Wake-up call!