I noticed that I was having problems connecting with mysql using php. When I read the php page on mysql functions someone had posted a note about password authentication problems with mysql5
If you need the features offered ( or will be offered) in MySql 5.0, then you should consider Firebird 1.5 database which already have those features and is much more mature and no license cost.
I'm in the process of converting our mysql db to firebird.
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