If I was interviewing now here are things I'd be on the lookout for:
Team dynamics:
How do they interview (individually or as a team), do they undermine each other during the process, do they not play well together, is there obvious clique behavior, is it a fraternity, have they all worked together for awhile, is it a new team, what's the team lead like, has the team lead/mgr done the role before etc. Does the lead/mgr seem to respect his team, does he defer to them during the process at times or always take the lead?
Software:
Are they chasing the latest trends, behind the times, or a mix of using new tech but keeping things stable. Look for their thought processes, questions they ask are generally tailored more then they even realize to their environment. Are they more worried about getting a smart person that can figure things out or trying to find the guy who has esoteric answers to questions.
Company:
Does anyone outside the tech team interview you. For SMB's and/or startups, do they discuss the financial condition of the company? Do they avoid answering any questions you ask about the company from a financial aspect or team aspect etc. Is their culture open or closed? What are the working conditions like. When you tour is everyone heads down and no one is talking etc? Do you see any team members having some fun, laughing etc.
These are just ways I like to start evaluating companies. I don't really interview anymore as I run my own firm, but when we are engaging from a consulting perspective these are similar things that I do to gauge who the company is and who the team is we would have to work with. It tells me if we will have trouble with the team, if we should even take the job etc.
No matter what, good luck.