Yes, definitely. Every time I have ever experienced a guy who has liked me, it has been pretty apparent.
Some of the sure fire signs have always been: joking around, making me laugh, always saying hi and making special trips or excuses to talk to me or see me. Being interested in how I'm doing, how my weekend was....One of the easiest signs is actually if they start asking about what your favorite movies and what kind of music you like. If after that, they continue to seem to really enjoy your company, usually it means they're fond of you.
I've always found it easier to just ask the guy (if I was interested in them back) if they liked me. This way it cuts out the annoyance of not knowing and kills the crush stage. If they don't like you, there's no use in pursuing it and if they do end up liking you, you've cut down the time that it takes waiting for them to ask you out!
Plus, I've always found guys more cool about knowing a girl likes them if they're not interested than if a guy tells a girl. Being a girl, it would bother me knowing that a guy liked me if they told me and I didn't like him back. From my experience the guys who weren't interested in dating me when I asked, were cool about it and didn't make it into a big deal.