You need to be careful about making offers on those properties, because the bankruptcy judge HAS to also approve the sale, and has the power to rollback any transactions within +/-6 months of the date when the gavel falls on a case.
As long as you make sure to take the extra precaution, then the process of making offers on those properties is basically the same as making offers on any other properties.
Also, it's not enough to work with an agent who specializes in (pre-)foreclosures, short-sales, and REOs. You also need to make sure s/he has experience with making offers on properties in bankruptcy. Afterall, you wouldn't want to learn 6 months or so after the fact that the bankruptcy judge disapproved of and cancelled your purchase, and has signed an order to evict you immediately. (Although that's kind of extreme and it doesn't always happen, it's certainly possible and has happened from time to time.)