Nad A.:
The thing is that space can seem infinite from our point of view as humans but still be finite in actuality - the whole surface of a balloon analogy. It would make the most sense to me that the universe is infinite but science deals with evidence, not what 'makes sense' to our brains - brains which only evolved to understand simple things at this human-size level.
This "surface of a balloon" thing is not as difficult to grasp as one might think. All you need is a new word: boundless.
Imagine the earth as a perfect solid sphere, and you walk on the surface of the earth. You will never reach an end, never get to a boundary. (There are no fences or national borders on our perfect sphere.) In other words, the surface of the earth is a boundless two-dimensional manifold. However, it is clearly not infinite, but it is in fact finite: If you decide to start settling the perfect sphere and give every settle a 10,000 square-foot lot, then this boundless surface will hold only so many settlers, definitely not infinitely many lizard people.
Just as the surface of a sphere is a finite, but boundless two-dimensional manifold, the space that "houses" our universe is probably a finite, but boundless three-dimensional manifold. But who is to say our universe is the only one in existence right now? And I don't even want to start complicating things by bringing the dimension of time into consideration.
Ultimately I'm with the Buddha on this one. An answer to the question whether the universe is infinite is neither necessary nor sufficient for liberation.