Ok so I have been riding for several months using spd mtb pedals and shimano shoes and not having any problems. I now just bought a pair of sidi road shoes. I am having a terrible time reclipping in when taking off at stop lights. Is there any tricks or am I just uncoordinated? Maybe just more practice. Thanks for any help.

Probably just more practice. Different shoes/cleats take some time. What pedals are you running on your SIDI road shoes?

... Brad

It never gets any easier, you just get faster.

It becomes a lot easier, I think Look style are easier than my old SPD's that I originally learned on

LeMond may be crazy, but truer words have never been spoken.

SPDs are easy to clip into - way easier than Look style.

SPD's are pretty easy to clip into w/ SIDI's, so keep with practice after checking to make sure everything is right with the set-up.

I believe the pedals are shimano pd-540's

I have 540's and Sidi's. Unless something is amiss, this should be really easy. Do the pedals work fine on other shoes?

Loosen the tension on the pedals and grease the cleat.

with spd's I hardly had to look down to clip in, and could pedal a few strokes before I clipped in. I now have ultegra pedals w/ road shoes and cleats, and clipping in takes more concentration and deliberance.
I usually push off strongly, then look down (longer than w/ spd's) to get the pedal right, then position foot and clip in. The smooth carbon sole below the cleat does not allow ANY pedaling if the pedal ends up there, my foot slides off the pedal like ice. So, I take a second longer on the "look down" phase to get it right the first time.

With one foot still clipped in you can still slow pedal while clipping the other foot in. Don't be in too big of a hurry; after a while it'll be second nature.

Consider Speedplays - having used Look, Time and Speedplay I can tell ya getting into the pedal is wayyyyy easier on the Speedplays.