EVEMon is an awesome goon created program. It lets you monitor your skills and plan skill training for the future. Get this program now.
EVEMon is a free, open source program that you can use to plot out your skill training program weeks in advance, look at how long things will take, etc. Most people pick a specific ship type as a long-term goal -- say, battleships, or covert ops frigates, or whatever -- and then work towards that goal over time. Familiarize yourself with the different types of ships out there, talk to people, figure out what you'd like to do, and work towards it!
When consulting the various ship listings in this Wiki, some of them have recommended Skill Packs listed. These can be loaded into plans to give you an idea of how much time would be required to properly train your skills to the recommended level for the ship for optimal fitting. EVEMon also allows you to determine the difference in training time if you were to use implants.
If you want to check how long it would take to train an alt for a specific task, use these XML templates to create a dummy character in EVEMon.
Official website: http://evemon.battleclinic.com/
EVEMon-like apps for other platforms
MacEveApi, get it here: http://www.eveonline.com/ingameboard.asp?a=topic&threadID=1096971