The USCG has since resumed posting the question bank on their web site and can be found on their website here:
Current NMC License Deck Prep Site
Current NMC License Engine Prep Site
If you are looking for test prep web-sites and test generators, here are the ones I've used or have heard of others using:
I scraped the USCG site with the test questions for personal use before they took them down in 2009. They have added more questions to the pool now but here is what they had then. Even if the questions are different, it helps to have an idea of the sometimes odd syntax they use for the questions. Here are the files:
WARNING: PDF/ EXCEL/DOC File
Deck:
Chart Header Index 65kb
Deck Ref Library April 2007 64kb Books Questions Taken From
Gen_Dk1 414kb Drawings
Gen_Dk2 417kb Drawings
GeneralBook2 626 kb Questions
GeneralNavBook3 500 kb Questions
NautAlmanacCGExamsFull 61.2 Mb Bowditch 2?
Nav_Gen1 122 kb Drawings
Nav_Gen2 261 kb Drawings
NavProblemsBook5 659 kb Questions
NMC-2GuidancewManualforLoadingMVGr 14.5 MB Loading Manual
NMC-2OperatingManualforCoastalDriller 63.9 MB Operations Manual
NMC-2OperatingManualforDeepDriller 71.8 MB Operations Manual
NMC-2StabilityDataRefereceBook 28.6 MB Stability Book
Questions-w-Tables 94 kb ?
rotrbook1 287 kb ROTR Questions
rules1 155 kb Drawings
rule2 572 kb Drawings
safety 195 kb Drawings
safetybook4 1.2 Mb Questions
sail 7 kb Drawings
Engine Drawings
Electrical 1.6 Mb
General 4.9 Mb
Motors 3.9 Mb
Refrigeration 943 kb
Steam Engines 893 kb
Safety 931 kb
Stream Generators 866 kb
Engine Questions PDF
General Book 11 966 kb
Electric Book 12 437 kb
Steam Book 13 509 kb
Motor and Aux Book 14 657 kb
Safety Book 15 593 kb
Engine Questions EXL
General 1.6 Mb
Electrical 712 kb
Steam 803 kb
Motor and Aux 1 Mb
Safety 878 kb
Engine Other
NewandRevised_July07 58 kb
Previous_Proceedings_12-04-06 485 kb
QuestionReferences-June06 38 kb
Questions_With_Illustrations 1.4 MB