Altavista Translations - The Online Translator.  Although it doesn't do a very good job with grammar, it translates from English to Spanish and Vice Versa, and does a good enough job to let you understand the sentence.  However, since it translates word for word, the grammar needs help, hence it isn't too much help in essay writing.

Multilingual Dictionaries - Online dictionaries in English, Spanish, German, French, and more.  The site could be rather slow at times, give it some time.

Destinos Summaries - Summaries of every Destinos episode that you'll ever see.  Best of all, they're in English. As some of you may know, the old destinos summaries were taken down some time ago. However, I found a new site, and this they're on my own server, so these are here to stay.

Spanish Verb Forms - My own list of all Spanish verb forms through the 1st semester of Spanish 7/8.  This list is constantly being updated, so check back periodically. 

Por o Para? - This is one of the biggest problems for many Spanish students.  This is my own compiled list of when to use por and para.  This is constantly being updated, so check back periodically.

Basic Spanish Words with Pronunciation - Is it possible to make a worse looking website?  Most of the stuff here is quite useless, but they do have English - Spanish online dictionaries, which are always useful
Note:  Due to filtering, you may  not be able to access this site from certain public computers

Spanish Voice Synthesizer - A very unique site, but it's relevance could be challenged.  If you type in a line, it will take it and turn it into voice.  You can choose the dialect, speaking speed, and several other options.  Requires sound card and speakers.

The Conjugator Tranier - A good place to practice conjugating verbs in Present, Preterite, and subjunctive.  Also teaches where to place accents (The count back 3 vowels rule won't work past 2nd year.)
Note:  Due to filtering, you may  not be able to access this site from certain public computers

Spansih Web Dictionaries - Contains lists of irregular and stem changing words, links to web dictionaries, translators, and other helpful resources. 
Note:  Due to filtering, you may  not be able to access this site from certain public computers

Altavista Translations - The Online Translator.  Although it doesn't do a very good job with grammar, it translates from English to German and Vice Versa, and does a good enough job to let you understand the sentence.  However, since it translates word for word, the grammar needs help, hence it isn't too much help in essay writing.