Why is it that people expect that everything is free? Anna spent a lot of time on layout, bookmarking, indexing, and linking. Asking $7 seems like me as a good deal for those of us that have a shortage of free time, or just hate doing booring stuff.
$7 is about 40 minutes of work during normal working hours, even less if i work during overtime. What Anna did is worth certainly a lot more than 40 minutes of work.
Yes, you can get the SRD for free from the WotC site, even in PDF form from other sources, but does it have the same functionality as the pdf that Anna sells? Do you want that functionality? If Yes, then you have a couple of options, 1.) do it your self, 2.) find someone else to do it, for a.) free, b.) payment (cold hard cash or for sexual favors ;-).
Getting something for free is a privilage, not a bloody right!
Anna, it could be wise to make a list on RPGNOW for your product that has all the added functionality listed. A list that makes clear why people should buy the SRD from you. It might also be nice to post a couple of images that show what the document looks like (one with a page of the index, table, text, etc.).