Get it here.
Here is the next beta of MacJournal 5.2.4. This is an unofficial final candidate build. That is, I'm not expecting to have to change anything before the final public release. In terms of what has changed in this beta, a few bug fixes and a few syncing changes. Starting a sync with an iPhone will do a backup first (just like with MobileMe). The automatic sync behavior is on by default now, but you can disable it. MacJournal entry URLs are now created with their IDs instead of topics, making for greater stability if you rename the entries. Also, you can sort search results in the entries list and that sorting will be remembered separately.
Please let me know of any problems you have by emailing me.