Although we don't believe in timing the market or panicking over market movements, we do like to keep an eye on big changes -- just in case they're material to our investing thesis.

What: Shares of clustered storage specialist Isilon Systems (Nasdaq: ISLN) jumped 30% over the weekend on news that EMC (NYSE: EMC) is serious about buying the company.

So what: EMC's all-cash offer of $33.85 per share values Isilon at $2.25 billion after backing out the company's $114 million of debt-free cash. It's a generous buyout premium for a small firm, but EMC is happy to pay top dollar for a fine patent portfolio and a great engineering team.

Now what: The buyout mayhem in the storage industry continues unabated. Will this be the final straw that inspires final takeover offers for backup expert Quantum (NYSE: QTM) or disk builder Seagate Technology (NYSE: STX)? Stay tuned.

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