There are all sorts of reminder systems available out there. I'm posting just 3. If you know of more just add them. Tizkeh Lemitzvos:
Text Message:
text sefira to 41411 for a nightly reminder at approximately 9:30 PM EST.
or text sefiraday to 41411 for a daily reminder at approx. 11:30 AM EST.
Of course when Shabbos/Yom Tov come around we don't have much choice. But maybe then we are more prone to remember.
And also don't forget that if you daven at a early minyan it is of utmost importance to have some method to remember to count later on (e.g. telling someone to remind you, or the like).