I have the iPad 2 with iOS 6. It doesn't work with Mventix because their site requires Flash, which the iPad doesn't use.
You can upload files under iOS 5 using the browser iCabMobile or (much easier) natively under iOS 6.
My favorite apps for MSing are Notability and GoodReader. Notability lets you type, handwrite, draw, insert pics or other items, then it will let you choose a format in which to save. Formats include PDF, RTF and Notability's note format. You can then email the file, tweet it, print it, open it in another app on your iPad or upload it to a variety of different online storage services (e.g. Box, Dropbox, WebDAV servers, etc.)
I prefer GoodReader to edit PDFs. I could do that in Notability, but I have a soft spot for GoodReader because I've used it the longest and it's so flexible for editing. (Please note that I am editing a PDF copy of the report, so I then have to enter my report into the MSC's website.)
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Go ahead, ask me to violate an ICA. I won't do it, and the MSCs that read the board will know not to hire you, since you can't be trusted.