On June 17, 2010,

Chromium’s blog announced that the latest Google Chrome dev build for Windows and Mac includes a plug-in for viewing PDF files. The plug-in can be enabled by going to chrome://plugins/ and clicking on “Enable” for the “Chrome PDF Viewer” plug-in.

and On February 17, 2011, Google OS said,

If you use Google Chrome and you haven’t disabled the built-in PDF plugin, you can now open PDF attachments from Gmail using your browser’s viewer. Just click “View” next to the attachment and you’ll notice that the PDF file opens faster and it looks much better.

The Chrome PDF plug-in is faster than the Google Docs previewer, its rendering accuracy is better, and you don’t have to change settings anywhere for this to take effect. Just use Gmail in Google Chrome and the ‘view’ link will automatically open your file in the Chrome PDF viewer.
The change is also nice because Chrome’s PDF plug-in actually lets you print, unlike the previewer which can only manage recursion printing (it generates a PDF of your PDF).

yesterday(Nov 17, 2010), I received a requirement email from my Batch ReaderEnable customer,

I contacted you for a advise on PDF compare. we do have a requirement to Comparing the version of PDF files, when we are using Acrobat inbuilt compare options, it’s comparing only the text and it’ll miss out the formatting elements (bold, italic, superscript, subscript, bolditalic etc), it caused lot off manual work and time consuming, do you have any idea or software for this, if so please inform us, we will discuss the cost.

and I occurred to DiffPDF, a Free open source and cross-platform software that can compare two PDF in text and appearance mode. it is developed in Qt and bases on Poppler-qt.

P.S.
I has recommend it to PortableApps.com, and hope it can be accepted.

wkhtmltopdf is a simple shell utility to convert html to pdf using the webkit rendering engine, and qt.
pdf2swf(part of SWFTOOLS) is A PDF to SWF Converter. Generates one frame per page. Enables you to have fully formatted text, including tables, formulas, graphics etc. inside your Flash Movie. It’s based on the xpdf.
Both of them are open source and can works on multi-platform(cross platform), so If we want to convert a html file or webpage to SWF, we can use wkhtmltopdf to convert html(webpage) to PDF, then use pdf2swf to convert pdf to swf.

reference,

• SWFTOOLS home page, http://www.swftools.org/
• wkthmltopdf home page,http://code.google.com/p/wkhtmltopdf/

P.S. A simple routine and example(result),
wkhtmltopdf "http://www.grzmobile.com/blog/2009/11/13/integrating-lua-into-an-iphone-app.html?printerFriendly=true" "Integrating Lua into an iPhone App.pdf"
pdf2swf "Integrating Lua into an iPhone App.pdf" "Integrating Lua into an iPhone App.swf"

• Html example(a webpage),Integrating Lua into an iPhone App
• the Integrating Lua into an iPhone App.PDF created with wkhtmltopdf
• the Integrating Lua into an iPhone App.swf created with pdf2swf