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Welcome to Spehro Pefhany's Useful Design Information:

Modbus Design Links 

Miscellaneous Information

Fonts for LCD and LED Displays

Postscript Stuff for Designers

If you enjoyed the old Amateur Scientist columns from Scientific American, here is a great
deal from Amazon.com (I get a small kickback if you order from the below link):

Here is the classic book on designing electronic circuits. Sure, it's getting a bit dated, but I'll
bet that when the rumored and long awaited new edition is finally released, you'll still hang
onto this book too. (I get a small kickback if you order from the below link):

This book is a useful resource for building a lean TCP/IP implementation New- 2nd Edition. Read the
reviews before ordering. (I get a small kickback if you order from the below link):

The mother of all dictionaries. A must for writers etc. Comes with a magnifying glass, as each page has been condensed from 4 of the original pages. Currently 30% off + free shipping. (I get a small kickback if you order from the below link):

For mechanical design, this is the reference book you need for US standard fasteners, materials and just about anything else. Mine is well-thumbed. (I get a small kickback if you order from the below link):

Here's the same thing but in a large-print edition. (I get a small kickback if you order from the below link):