Microsoft is being such a spoilt sport in getting its products into the market that it really irritates me. Initially I was so excited with silverlight that I thought I should learn it. Once I stepped into the lapping waters of silverlight, I realized how badly you need to depend ONLY on microsoft technologies to take a swim to the deep end. Here's why:
XPath is almost a W3C standard. Its almost necessary for all programs to have an XPath parser. Microsoft can be so uptight in packaging silverlight that they left XPath out and have only provided support for LINQ to XML.
This is almost like Karunadhi insisting on speaking to the Australian players in Tamil. Its quite annoying in my personal opinion. Now im interested in making an XPath library for silverlight.