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Links to online help:

English as a Foreign Language for Engineers
Online texts and exercises collected by Jean-Claude Viel, EFL Tech - France.

Online Technical Writing
Learn how to write technical reports. Very good introductory online textbook provided by David A. McMurrey.

Technical Report Writing
NASA Technical Memorandum 105419, explains the basics of writing technical reports.

Technical Writing
About.com Guide Gary Conroy provides a wealth of information and resources pertaining to technical writing. The focus is on information technology and the computer industry but there's also a lot of stuff for engineers in more traditional fields.

English as 2nd Language
About.com Guide Kenneth Beare provides information and help to foreign speakers of English.

Links to published help:

How To Write & Publish a Scientific Paper: 5th Edition
by Robert A. Day

Scientific English: A Guide for Scientists and Other Professionals
by Robert A. Day

How to Write and Illustrate a Scientific Paper
by Björn Gustavii

The Elements of Style, Fourth Edition
by William Strunk Jr., E.B. White, Roger Angell

The MIT Guide to Science and Engineering Communication
by James G. Paradis and Muriel Zimmerman