What are you trying to do, exactly?
Both LR and iPhoto are photo managers. iPhoto is firmly pointed at the home user with a point and shoot camera, LR is a professional grade application aimed squarely at the Raw shooter.
In either case +they both do the same job+, so using both is a bit like writing your Novel in Word and also in Pages at the same time.
Assuming you want to import pics from your camera, store them, process them and then organise them into albums etc, I would use Lightroom. It's just a more powerful app for the job.
Then, if there's something that LR can't do - for instance, Slideshows or books or whatever - then export the pics you want to use from LR to the Finder and import into iPhoto, or use *_
this_* LR plug in to automate the process.
I have read several posts which are contradictory in regards to importing photos into Lightroom from Iphoto.
You need to understand something. Both Application are
Databases. A photo needs to be imported before they can even see or manipulate it. While Aperture can read the iPhoto database, LR is utterly oblivious to the iPhoto DB and vice versa.
Some say to export files to Finder and then use Lightroom to import.
This is the correct way.
Others say to open Iphoto Package Contents, make alias and use Lightroom to import.
Never, ever do this. Any slight change to the path of the file and your iPhoto Library is toast.
but would like to import selected photos or events into Lightroom for processing.
Frankly, this sounds to me more like a job for Photshop Elements rather than LR.
Regards
TD