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Fill a Used Print Cartridge with Invisible Ink
Posted by Kevin Purdy at 9:30 AM on April 27, 2008
If you've got a spare printer ink cartridge and a document you only want one person to see—or just some free time and a cloak-and-dagger kick—one helpful Metacafe post has a project for you. The tutorial requires a utility knife, some invisible ink pens and a syringe, and an empty ink cartridge, with black seeming to be an easier solution that the yellow-only solution the creator recommends. It's a fun way to cover up sensitive documents, and a guaranteed friend impresser as well.
Need some lined paper for note-taking, graph paper for drawing, or bi-colour paper for budgets? Printable Paper has you covered, assuming you've got access to a printer. All of the many, many templates are free and available in PDF format, and go far beyond 8.5 x 11 sheets to business cards, receipts and invoices, and beyond. Good starting point for making your own templates, or a good bookmark for those moments where one sheet can hold you over.
Save some system resources and share multiple printers between more than one machine by recycling that old "junk" system sitting in your garage into a dedicated print server. eHow has a step by step tutorial that takes you through exactly what you need to do to accomplish this; the process is a bit lengthy, but well worth it if you share printer resources. FYI, this also frees up counter space since your printer can be wherever you want it with this setup—and it will work even more efficiently if you 
Flummox your coworkers with an "Insert Coin" message on the office printer using the HP Printer Job Language (HPPJL) command set. The Hackszine blog describes how to customise the Ready prompt on HP printers' LED display with a few simple commands: 
