Thanks to everyone for their answers. I will be trying SID on my next lap quilt. And will do it in the seam. Now for another question about it...will this work if the seam is pressed open or should seams be pressed to one direction?

Yes it will work. I press most of my seams open in my tops. Rarely to I press to one side. I like the flatness of an open seam. Do use your walking foot. I find if I lift the quilt so that there is no pulling from the weight of it in my lap it goes much much more easliy. I sew a about a foot then reposition the quilt in my lap to give it some slack to feed through , just remember needle down , when repositioning.

I like the flatness of open seams, too. Thank you for your answers. You really helped me out.

I do SID in the seam. I also do accent quilting 1/4 inch from the seam depending on the block. For instance, the pinwheel block lends itself very nicely to stitching 1/4 inch in from the seam in each "spoke" - gives the block nice definition. Bottom line is to study your quilt and decide what you will like best when quilting!

I do both, sometimes it's just easier to be slightly to the right of the seam (or the left if you're more comfortable with that), the pattern of the fabric usually dictates that for me. If it's an easy pattern on the eyes, I go for sewing into the seam.