Possibly the most important tool in a successful absorption into Israeli society is the ability to speak Hebrew. Although every Oleh Chadash is entitled to a free Ulpan upon Aliyah, any study that can be done in advance is highly recommended. Classes are often available on College Campuses, in synagogues or in your local JCC.
Here are some links to some available resources for learning Hebrew overseas - if you have feedback or suggestions or if you'd like a list of "bricks and mortar" ulpanim in Israel send an email to neilg@jafi.org
Misrad Haklita's resources - video, comics, radio and more - free!
HebrewUlpan.com - online learning with experienced teachers
Learn Hebrew - phonetic, audible, by subject - all free!
Learn Hebrew verbs - free and simple
Hebrew University teaches the Alef Bet - free!
LearnHebrewPod - 22 free lessons currently online. With downloadable worksheets - listen online or download to your iPod!
Say in in Hebrew - online Hebrew phrasebook - free!
My Hebrew Teacher - learning over the phone
iStudyHebrew - on-line study
Ulpan Or - distance learning options
Facebook - Hebrew word of the Day