I'm not familiar with Deltacrypt, but a quick visit to their Web site made me nervous about choosing their product as an alternative to PGP.
When looking at an encryption product for personal or corporate use I tend to focus on two issues: the results of extensive peer review of the product and algorithm by the crypto community; and the credibility of the vendor.
Deltacrypt seems to have neither. In fact, they don't even mention who is behind the company. While the site does give some detail about their proprietary algorithm, it's meaningless unless they have extensive testing feedback to back it up.
My advice is to stick with well-tested mainstream products, even if some of them are a pain in the a...
For more information on this topic, visit these other SearchSecurity.com resources:
Strom's Security Tool Shed: File encryption made easy
Strom's Security Tool Shed: File encryption software ideal for laptops
Ask the Expert: Fluid on the fly encryption products
This was first published in March 2002