There are several ways to remember to “count Sefira” every night between the second night of Pesach and Shavuot.
The preferred method is to attend minyan and count together with the tzibur at shul each night, or be reminded each morning in case you forgot the night before.
(Yes, that is a not so subtle hint to encourage minyan attendance!)
Another method is to have a chart right by your bed to remind you to count before you go to sleep.
Some families have a great practices of making sure they check with each other each night to remind them to count.
Technology has of course become a great resource as well and there are many services that will send text message reminders etc. One such resources is available through the OU website
http://www.ou.org/holidays/sefirat-haomer/download_sefirah_5773_2013_calendar/#.UWcpd7XkvOB
And to round things out, here’s a fun cartoon especially for those of you who have young children who love to count numbers!