American vs. British English

Here you can find a list of the main differences between American and British English. (Source: English Grammar in Use: Intermediate by Raymond Murphy)

Journalistic Titles

Here you can find a brief explanation on journalistic titles used in, e.g., newspaper headlines.  We, however, should not use this style for our titles in administrative writing, unless it is a press release.  How would you change the headlines provided as examples in the hot-linked document into administrative style titles?

Subjunctive

A webpage on the use of subjunctive is hereby made available.

Notes/Memos

Here you can find the document on notes or memos.  If you like, you can send me the texts for the tasks on page 10 before our next session.

Here is an another model for a memo.

Collocate dictionary

Here you can find an online collocate dictionary.  There you have the option of comparing collocations in Corpus of Contemporary American English (COCA), Corpus of Historical American English (COHA), Time Magazine Corpus (TIME), British National Corpus (BNC) and Google.

Mandatory, obligatory and compulsory

These words can indeed be used as synonyms in most contexts.  I also like the first response in the forum at the following link:
http://answers.yahoo.com/question/index?qid=20080507075259AAR2USG

Here is a link for another forum which can be useful, as well:
http://english.stackexchange.com/questions/2902/mandatory-obligatory-compulsory