The check to keep the number of log entries under a configured maximum doesn't work reliably in a multithreaded environment.
Discovered this courtesy of OOM exception:

01-31 01:17:03.169  24220-24220/com.paloma.photochat E/dalvikvm-heap﹕ Out of memory on a 25459364-byte allocation.
01-31 01:17:03.169  24220-24220/com.paloma.photochat I/dalvikvm﹕ "main" prio=5 tid=1 RUNNABLE JIT
01-31 01:17:03.169  24220-24220/com.paloma.photochat I/dalvikvm﹕ | group="main" sCount=0 dsCount=0 obj=0x40209178 self=0xcf80
01-31 01:17:03.169  24220-24220/com.paloma.photochat I/dalvikvm﹕ | sysTid=24220 nice=0 sched=0/0 cgrp=default handle=-1345006336
01-31 01:17:03.169  24220-24220/com.paloma.photochat I/dalvikvm﹕ | schedstat=( 9779331033 5074622607 4664 )
01-31 01:17:03.169  24220-24220/com.paloma.photochat I/dalvikvm﹕ at java.lang.AbstractStringBuilder.enlargeBuffer(AbstractStringBuilder.java:~95)
01-31 01:17:03.169  24220-24220/com.paloma.photochat I/dalvikvm﹕ at java.lang.AbstractStringBuilder.append0(AbstractStringBuilder.java:140)
01-31 01:17:03.169  24220-24220/com.paloma.photochat I/dalvikvm﹕ at java.lang.StringBuilder.append(StringBuilder.java:125)
01-31 01:17:03.169  24220-24220/com.paloma.photochat I/dalvikvm﹕ at org.json.JSONStringer.string(JSONStringer.java:344)
01-31 01:17:03.169  24220-24220/com.paloma.photochat I/dalvikvm﹕ at org.json.JSONStringer.value(JSONStringer.java:252)
01-31 01:17:03.169  24220-24220/com.paloma.photochat I/dalvikvm﹕ at org.json.JSONArray.writeTo(JSONArray.java:572)
01-31 01:17:03.169  24220-24220/com.paloma.photochat I/dalvikvm﹕ at org.json.JSONStringer.value(JSONStringer.java:233)
01-31 01:17:03.169  24220-24220/com.paloma.photochat I/dalvikvm﹕ at org.json.JSONObject.writeTo(JSONObject.java:667)
01-31 01:17:03.169  24220-24220/com.paloma.photochat I/dalvikvm﹕ at org.json.JSONStringer.value(JSONStringer.java:237)
01-31 01:17:03.169  24220-24220/com.paloma.photochat I/dalvikvm﹕ at org.json.JSONObject.writeTo(JSONObject.java:667)
01-31 01:17:03.169  24220-24220/com.paloma.photochat I/dalvikvm﹕ at org.json.JSONObject.toString(JSONObject.java:636)
01-31 01:17:03.169  24220-24220/com.paloma.photochat I/dalvikvm﹕ at de.akquinet.android.androlog.reporter.MailReporter.send(MailReporter.java:82)
01-31 01:17:03.169  24220-24220/com.paloma.photochat I/dalvikvm﹕ at de.akquinet.android.androlog.Log.report(Log.java:1206)
01-31 01:17:03.169  24220-24220/com.paloma.photochat I/dalvikvm﹕ at de.akquinet.android.androlog.Log$1.uncaughtException(Log.java:453)
01-31 01:17:03.169  24220-24220/com.paloma.photochat I/dalvikvm﹕ at java.lang.ThreadGroup.uncaughtException(ThreadGroup.java:854)
01-31 01:17:03.169  24220-24220/com.paloma.photochat I/dalvikvm﹕ at java.lang.ThreadGroup.uncaughtException(ThreadGroup.java:851)
01-31 01:17:03.169  24220-24220/com.paloma.photochat I/dalvikvm﹕ at dalvik.system.NativeStart.main(Native Method)

configured 1500 entries and ended up with 45000.
Synchronizing the Log.collectLogEntry(..) method is one possible solutions, another solution may be to turn the check from an "if" to a "while" loop.