Slow propagation of "young" coins?

[SuperP]

I have noticed that if I quickly make multiple and small (less than 0.01 BTC) transactions from Bitcoin-Qt, the first one shows up at http://blockchain.info right away (5 seconds).  But if I make one or more transactions right after that, it can take over 10 minutes to show up at http://blockchain.info.  I'm not talking about confirmations, I just mean propagation of the transaction through the network.  When I try to check the transaction at http://blockchain.info/tx/ it gives me "Transaction Not Found"

If I use http://blockchain.info/pushtx/ to manually broadcast the transaction, then it seems to work.

Has anyone else noticed this behavior or can anyone reproduce it?

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[IncreaseMyT]

Yes I noticed that today.  I sent one trans that took 3 hours, then I sent another and 30 minutes later they went through at the same exact time.

When I searched the addy on blockchain it said no transaction found, even thought the client pinged to show incoming.