One of the biggest problems with print design is that at times, post production is not taken into account while the design is being developed. A well crafted design must take into consideration all the steps necessary to produce it.
Texas Litho has some very interesting information on their website that can help insure your project does not stumble into production issues.
Their frequently ask questions section has some good information about initial setup of digital artwork destined for the press. You can find it here
They also have compiled a comprehensive list of envelope charts that may come in handy when designing an invitation, thank you card or any envelope related design project. Envelope Chart
One of the biggest issues faced while working on files that require folding, is that the design never took into consideration the thickness of the sheet, therefor the final piece will not fold correctly. Texas Litho has a tool that can help you determine the size of the panel for your folding design to insure it folds correctly. You simply chose the type of fold required for your project, you enter the width of your sheet, and you get the varying width for each of your panels. Finding Utility
At Grapho Studios we are always developing new and innovating web implementation for our clients. With these tools we hope that designers find value in the information they provide.