Twitter has quickly become the best place to go for up-to-date info on the Egyptian protests. In case you wanted to follow the real-time events, the best hashtags right now are #jan25, #egypt and #mubarak.
One word of caution- If you are using a third party Twitter client like Tweetdeck, following these hashes during peak hours is a bit difficult due to the massive amount of tweets. When this happens, your best option is going back to the good-old web version of Twitter. You may not see every tweet that includes the hash, but at least you will be able to read some of them.
NPR has also listed some of the key Egyptian Twitter accounts to follow.