I haven't got the FCOM Volumes 1-4 on my iPhone as pdfs, but do have the Part B and some other pdf files. I use
Air Sharing. There are a couple of problems, mainly one of navigation - you can't do a word search in the Part B. The other problem is that static documents requiring some concentration don't seem to work very well on the iPhone. Staring at the Part B is quite hard work, and if you enlarge too much, you end up swiping the page from side-to-side which is a real bore.
I've also tried using
Stanza to convert the pdfs into more iPhone-friendly text, but the results are pretty awful.
I've tried putting the FCOM volumes on as html, which work fine, except for the issue of navigation. You can open one page, but then have to close it and find the next one. As the FCOMs are not very user-friendly to navigate as filenames eg "Vol1Ch20Sec10Top1000-eff1.htm" (!), it's just easier to open the LPC or just wait to get home!
Applemacster