The COC has an electronic version of its Katamarous (known as the E-katamarous) that you can install on your computer. Once installed you'll find it synchronised to the calendar set on your computer. In addition to providing all the daily readings (Matins, DL, and Vespers), it has the following features:
1) It notifies you of whether the day coincides with a season or Feast of the Church and whether or not that day falls within a fasting period.
2) It contains the entire Bible, including the Deuterocanonical texts, as well as convenient Bible search and index functions.
3) It notifies you of the Synaxarium entry for the day, and provides you with the entire entry to read.
4) It provides you with an Icon for the Saint being commemorated, according to the Synaxarium, on that particular day.
5) It holds a collection of electronic Icons that you can save to your PC.
It can be purchased here: http://www.agape-bookstore.com/product_info.php?products_id=6089
For a free online katamarous (i.e. to simply view, online, the Scriptural readings for the day according to the Liturgical calendar of the COC), see here: http://www.copticchurch.net/classes/getLectionary.php